A331321 - cp's OEIS frontend

A331321 a(n) = [x^n] ((x^2 - 1)(x^2 + x - 1))/(x^2 + 2x - 1)^2.

n	a(n)
0	1
1	3
2	8
3	23
4	64
5	175
6	472
7	1259
8	3328
9	8731
10	22760
11	59007
12	152256
13	391239
14	1001656
15	2556115
16	6503936
17	16505651
18	41788616
19	105571303
20	266181440
21	669923039
22	1683255448
23	4222878651
24	10579130112
25	26467818315
26	66138242984
27	165077936207
28	411584855488
29	1025162759287

[1, 3, 8, 23, 64, 175, 472, 1259, 3328, 8731, 22760, 59007, 152256, 391239, 1001656, 2556115, 6503936, 16505651, 41788616, 105571303, 266181440, 669923039, 1683255448, 4222878651, 10579130112, 26467818315, 66138242984, 165077936207, 411584855488, 1025162759287]

cp's OEIS Frontend

A331321 a(n) = [x^n] ((x^2 - 1)(x^2 + x - 1))/(x^2 + 2x - 1)^2.

Table of values

List of values

cp's OEIS Frontend

A331321 a(n) = [x^n] ((x^2 - 1)*(x^2 + x - 1))/(x^2 + 2*x - 1)^2.

Table of values

List of values

A331321 a(n) = [x^n] ((x^2 - 1)(x^2 + x - 1))/(x^2 + 2x - 1)^2.