A158263 - cp's OEIS frontend

A158263 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	8
3	240
4	30256
5	15665664
6	32668147008
7	272033712041216
8	9024264001164470016
9	1192791193150627685091840
10	628748300357129103400036998144
11	1322980853407936018020929177243811840

[1, 8, 240, 30256, 15665664, 32668147008, 272033712041216, 9024264001164470016, 1192791193150627685091840, 628748300357129103400036998144, 1322980853407936018020929177243811840]

cp's OEIS Frontend

A158263 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