What is the next number in this sequence 3 -6 12 4 20 ?
What is the next number in this sequence of numbers: 3 -6 12 4 20 ? Need rule, thank you!
What is the next number in this sequence of numbers: 3 -6 12 4 20 ? Need rule, thank you!

Tristain H.
Hsiao-harng S.
Joe H.