A184900 - cp's OEIS frontend

A184900 a(n) equals the coefficient of x^(2n-1) in the (2n-1)-th iteration of x+x^3 for n>=1.

n	a(n)
1	1
2	3
3	30
4	588
5	17550
6	708840
7	36195159
8	2237012232
9	162374762574
10	13540681147257
11	1275717308712000
12	134010130947557040
13	15530163914778879015
14	1968213292803618315390
15	270798818519865663526320

[1, 3, 30, 588, 17550, 708840, 36195159, 2237012232, 162374762574, 13540681147257, 1275717308712000, 134010130947557040, 15530163914778879015, 1968213292803618315390, 270798818519865663526320]

cp's OEIS Frontend

A184900 a(n) equals the coefficient of x^(2n-1) in the (2n-1)-th iteration of x+x^3 for n>=1.

Table of values

List of values