-2, - 8,4, - 20,28, - 68... Find the rules,

-2, - 8,4, - 20,28, - 68... Find the rules,

-2 + (- 6) = - 2 + 6 × 2 ^ 0 × (- 1) ^ 1 = - 8 (- 8) + 12 = (- 8) + 6 × 2 ^ 1 × (- 1) ^ 2 = 44 + (- 24) = 4 + 6 × 2 ^ 2 × (- 1) ^ 3 = - 20-20 + 48 = - 20 + 6 × 2 ^ 3 × (- 1) ^ 4 = 2828 + (- 96) = 28 + 6 × 2 ^ 4 × (- 1) ^ 5 = - 68 rule: starting from the second term, each term is equal to the sum of the previous term and the other