A158260 - cp's OEIS frontend

A158260 a(n) = coefficient of x^n in the [2^(n-2)]-th iteration of x+x^2 for n>=2.

n	a(n)
2	1
3	2
4	30
5	2240
6	685160
7	810903456
8	3683654668512
9	64657586863790400
10	4426882384548801561472
11	1192052411353154132337483776
12	1270174918862853255008627489608704

[1, 2, 30, 2240, 685160, 810903456, 3683654668512, 64657586863790400, 4426882384548801561472, 1192052411353154132337483776, 1270174918862853255008627489608704]

cp's OEIS Frontend

A158260 a(n) = coefficient of x^n in the [2^(n-2)]-th iteration of x+x^2 for n>=2.

Table of values

List of values