If the first five terms of a given sequence are: 0,3 / 5 (3 / 5), - 8 / 7,5 / 3, - 24 / 11..., then a general term formula is "urgent! If the first term of the sequence {an} is A1 = - 7 and satisfies an + 1 = an + N, then an=

If the first five terms of a given sequence are: 0,3 / 5 (3 / 5), - 8 / 7,5 / 3, - 24 / 11..., then a general term formula is "urgent! If the first term of the sequence {an} is A1 = - 7 and satisfies an + 1 = an + N, then an=

[aibang knows]
Title:
If the first five terms of known sequence are: 0,3 / 5 (3 / 5), - 8 / 7,5 / 3, - 24 / 11..., then a general term formula is?
The general formula is: [(n's Square-1) / (2n + 1)] * (- 1) to the nth power
You see, right

Given that the general term formula of sequence {an} is an = 2 ^ (2n-1), then the first five terms of sequence {an} and S5 =?

a1=2 a2=8 a3=2^5 a4=2^7 a5=2^9
An is equal ratio sequence, common ratio q = 2 ^ 2 = 4
sn=2*(4^n - 1)/(4-1)
s5= 2*(4^5-1)/3=682

The general term formula of the sequence is an = sin n π / 4. Write out the first five terms of the sequence

Sin π / 4 = radical 2 / 2
sin π/2=1
Sin 3 π / 4 = radical 2 / 2
sin π =0
Sin 5 π / 4 = - radical 2 / 2