Sequence derivation 2 3 10 15 26 ( )

The general formula of sequence is an = n ^ 2 + (- 1) ^ (n + 1)
So the sixth is 35

RELATED INFORMATIONS

1. The derivation method of this sequence is The sum formula of the first n terms of the arithmetic sequence {an} is_____ The derivation method is as follows_______ The general formula of equal ratio sequence {an} is_____ The derivation method is as follows_______ The sum formula of the first n terms of the equal ratio sequence {an} is_______ The derivation method is as follows________ I just want to know what the derivation method is, so you just fill in the derivation method
2. Derivation of sequence problem Sn = 1 / A1A2 + 1 / a2a3 +. + 1 / Anan + 1 for Sn
3. Find the rules and fill in the numbers ① 1, 1, 2, 3, 5, 8______ ②0.625，1.25，2.5，5，______ ．
4. (1 / 21 + 1 / 31 + 1 / 41) * (1 / 31 + 1 / 41 + 1 / 51) - (1 / 21 + 1 / 31 + 1 / 41 + 1 / 51) * (1 / 31 + 41) 1 / 2)
5. (111+121+131+141)×(121+131+141+151)−(111+121+131+141+151)× (121+131+141)．
6. (1/11+1/20+1/31+1/40）*（1/21+1/30+1/41+1/50)-(1/11+1/21+1/31+1/41+1/51）*（1/21+1/31+1/41)=?
7. 51 and 1 / 4 * 4 / 5 + 41 and 1 / 3 * 3 / 4 + 31 and 1 / 2 * 2 / 3 2013 * 2011 / 2012 + 1 / 2012
8. Simple operation of 31:1 * 3:1 + 41:1 * 4:1 + 51:1 * 5:1
9. 31:1 * 3:2 + 41:1 * 4:3 + 51:1 * 5:4 + 61:1 * 6:5 + 71:1 * 7:6
10. 31:1 × 3:2 + 41:1 × 4:3 + 51:1 × 5:4 + 61:1 × 6 7 × 8 of 9 and 8 + 6 × 7 of 8 and 7 + 5 × 6 of 7 and 6 + 4 × 5 of 6 and 5
11. Sequence reasoning 1.-27,-64,-125,（） 2.2,12,36,80,（） 3.16,8,8,12,24,60,（） 4.4,3,2,0,1,-3,（） 5.4,11,30,67,（） 6.8,10,13,（）,25,26 7.24,6,4,（）,2,0
12. 5. 7, 11, 15, 23 infer according to the sequence law. What's next? A、26 B、27 C、28 D、29
13. Find the rule 51.2,64,80100, () don't call me Baidu, because Baidu doesn't have it
14. 51.2,64,80, (), () find the rule and fill in the number. How to write? And (), (), 19.8,13.2,8.8 also find the rule and fill in the number, how to write?
15. Fill in the numbers according to the rules: 51.2,64,80, (), ()
16. 1. Which of 9, 2, 11, 97, 51, 12, 91, 27, 39, 4 are prime numbers? Which are composite numbers?
17. Answers to 9 questions on page 27 of mathematics book of grade two
18. 6 questions on page 23 of the mathematics textbook for the first semester of the second grade of the people's Education Press 11.3, 6 questions
19. How to simplify the operation of 1 + 10 + 4 (10 / 35) + 2 (24 / 63) + 1 (51 / 99) + 1 (7 / 143)
20. Simple calculation of 0.865 * 51% + 51 * 35.5% / 2 * 1 / 50 + 4.9% * 12 and 1 / 5 There must be a process! Online and so on!