A158261 - cp's OEIS frontend

A158261 a(n) = coefficient of x^n in the (2^(n-1))-th iteration of x+x^2 for n>=1.

n	a(n)
1	1
2	2
3	12
4	364
5	49280
6	27297360
7	59855127360
8	515600292989376
9	17478262497392546432
10	2341170788069821884925696
11	1243964516830446590036473921536
12	2629751195406987463208250109864126464

[1, 2, 12, 364, 49280, 27297360, 59855127360, 515600292989376, 17478262497392546432, 2341170788069821884925696, 1243964516830446590036473921536, 2629751195406987463208250109864126464]

cp's OEIS Frontend

A158261 a(n) = coefficient of x^n in the (2^(n-1))-th iteration of x+x^2 for n>=1.

Table of values

List of values