A185523 - cp's OEIS frontend

A185523 a(n) equals the coefficient of x^n in the n-th iteration of x*(1+x)/(1-x) for n>=1.

n	a(n)
1	1
2	4
3	30
4	368
5	6370
6	143372
7	3983518
8	131891776
9	5073152322
10	222405974228
11	10948833767454
12	598115891581232
13	35907789570992898
14	2350053890768819484
15	166532363675821702206
16	12703556005092777381120
17	1037944178579609842602754

[1, 4, 30, 368, 6370, 143372, 3983518, 131891776, 5073152322, 222405974228, 10948833767454, 598115891581232, 35907789570992898, 2350053890768819484, 166532363675821702206, 12703556005092777381120, 1037944178579609842602754]

cp's OEIS Frontend

A185523 a(n) equals the coefficient of x^n in the n-th iteration of x*(1+x)/(1-x) for n>=1.

Table of values

List of values