Directions tell me to provide a recursive formula for the sequence and to specify what type of sequence it is.

1] 1,1,2,3,5,8

2] 5,10, 20, 40, 80, 160

I understand the patterns & how they derived the terms, but I can't figure out how to write the recursive formula. Help, please & thank you.

*Detailed instructions, if possible, please.