A242574 - cp's OEIS frontend

A242574 a(n) = [x^n] G(n,x) where G(n,x) is the n-th iteration of G(1,x) = x/(1-x+x^2), so that G(n,x) = G(n-1, G(1,x)) with G(0,x)=x.

n	a(n)
1	1
2	2
3	6
4	26
5	155
6	1225
7	12411
8	156416
9	2388060
10	43159172
11	905135396
12	21655104900
13	582527203011
14	17404200037095
15	571581950390602
16	20454815744801708
17	791762421402479311
18	32941802599154381634
19	1465274545936840236164
20	69358520116965601147778

[1, 2, 6, 26, 155, 1225, 12411, 156416, 2388060, 43159172, 905135396, 21655104900, 582527203011, 17404200037095, 571581950390602, 20454815744801708, 791762421402479311, 32941802599154381634, 1465274545936840236164, 69358520116965601147778]

cp's OEIS Frontend

A242574 a(n) = [x^n] G(n,x) where G(n,x) is the n-th iteration of G(1,x) = x/(1-x+x^2), so that G(n,x) = G(n-1, G(1,x)) with G(0,x)=x.

Table of values

List of values