# Math Help - Recusion formula

1. ## Recusion formula

I had a question on this set of numbers and had to write down a recursion sequence for it.

1, 2 5 13, 34

2. Originally Posted by liu997
i had a question on this set of numbers and had to write down a recursion sequence for it.

1, 2 5 13, 34
$1 = 1$

$2(1) = 2$

$1+2(2) = 5$

$1+2+2(5) = 13$

$1+2+5+2(13) = 34$