A181545 - cp's OEIS frontend

A181545 G.f.: A(x) = Sum_{n>=0} (3n)!/(n!)^3 * x^(3n)/(1-x-x^2)^(3n+1).

n	a(n)
0	1
1	1
2	2
3	9
4	29
5	92
6	343
7	1281
8	4720
9	17899
10	68933
11	266364
12	1037423
13	4072439
14	16065148
15	63658521
16	253356763
17	1012049086
18	4055596343
19	16299779331
20	65683233938
21	265310551667
22	1073968967929
23	4355988107100
24	17699727361051

[1, 1, 2, 9, 29, 92, 343, 1281, 4720, 17899, 68933, 266364, 1037423, 4072439, 16065148, 63658521, 253356763, 1012049086, 4055596343, 16299779331, 65683233938, 265310551667, 1073968967929, 4355988107100, 17699727361051]

cp's OEIS Frontend

A181545 G.f.: A(x) = Sum_{n>=0} (3n)!/(n!)^3 * x^(3n)/(1-x-x^2)^(3n+1).

Table of values

List of values