# What is formula ib this sequence 3 -16 12 -24 48?

Odd terms: ${n}_{i + 1} = 4 {n}_{i}$ where i is the number in the odd sequence from 1 and upwards
Even terms: ${n}_{i + 1} = {n}_{i} - 8$ or $1 \frac{1}{2} {n}_{i}$