1, - 2,3, - 4,5, - 6,7, - 8,9, - 10,11 what are the rules of the group of numbers? Use a formula to express each number

1, - 2,3, - 4,5, - 6,7, - 8,9, - 10,11 what are the rules of the group of numbers? Use a formula to express each number

Positive and negative phases
X = n times the N + 1 power of (- 1)