A370623 - cp's OEIS frontend

A370623 Coefficient of x^n in the expansion of ( (1-x) / (1-x-x^2) )^(3*n).

n	a(n)
0	1
1	0
2	6
3	9
4	90
5	255
6	1671
7	6258
8	34674
9	148455
10	765141
11	3499551
12	17487531
13	82704921
14	408192420
15	1964826174
16	9657348546
17	46944246777
18	230604062127
19	1127574041325
20	5543828629305
21	27211172907207
22	133970970691311
23	659351846223252
24	3251029812112995

[1, 0, 6, 9, 90, 255, 1671, 6258, 34674, 148455, 765141, 3499551, 17487531, 82704921, 408192420, 1964826174, 9657348546, 46944246777, 230604062127, 1127574041325, 5543828629305, 27211172907207, 133970970691311, 659351846223252, 3251029812112995]

cp's OEIS Frontend

A370623 Coefficient of x^n in the expansion of ( (1-x) / (1-x-x^2) )^(3*n).

Table of values

List of values