A218251 - cp's OEIS frontend

A218251 G.f. satisfies A(x) = (1 + xA(x))^2 (1 + x^3*A(x)).

n	a(n)
0	1
1	2
2	5
3	15
4	48
5	160
6	550
7	1937
8	6954
9	25355
10	93633
11	349490
12	1316397
13	4997306
14	19100278
15	73440718
16	283876092
17	1102466529
18	4299673200
19	16832894330
20	66127276201
21	260595497227
22	1029913570587
23	4081124171097
24	16211144100379
25	64539011439944
26	257474646313530

[1, 2, 5, 15, 48, 160, 550, 1937, 6954, 25355, 93633, 349490, 1316397, 4997306, 19100278, 73440718, 283876092, 1102466529, 4299673200, 16832894330, 66127276201, 260595497227, 1029913570587, 4081124171097, 16211144100379, 64539011439944, 257474646313530]

cp's OEIS Frontend

A218251 G.f. satisfies A(x) = (1 + xA(x))^2 (1 + x^3*A(x)).

Table of values

List of values

cp's OEIS Frontend

A218251 G.f. satisfies A(x) = (1 + x*A(x))^2 * (1 + x^3*A(x)).

Table of values

List of values

A218251 G.f. satisfies A(x) = (1 + xA(x))^2 (1 + x^3*A(x)).