A261649 - cp's OEIS frontend

A261649 Expansion of Product_{k>=0} ((1+x^(3k+1))/(1-x^(3k+1)))^2.

n	a(n)
0	1
1	4
2	8
3	12
4	20
5	36
6	56
7	80
8	120
9	180
10	252
11	348
12	492
13	680
14	912
15	1228
16	1652
17	2180
18	2856
19	3744
20	4860
21	6256
22	8044
23	10284
24	13048
25	16520
26	20848
27	26140
28	32672
29	40756
30	50596
31	62576
32	77256
33	95060
34	116540
35	142592
36	174036
37	211736
38	257056
39	311448
40	376332
41	453764
42	546160

[1, 4, 8, 12, 20, 36, 56, 80, 120, 180, 252, 348, 492, 680, 912, 1228, 1652, 2180, 2856, 3744, 4860, 6256, 8044, 10284, 13048, 16520, 20848, 26140, 32672, 40756, 50596, 62576, 77256, 95060, 116540, 142592, 174036, 211736, 257056, 311448, 376332, 453764, 546160]

cp's OEIS Frontend

A261649 Expansion of Product_{k>=0} ((1+x^(3k+1))/(1-x^(3k+1)))^2.

Table of values

List of values

cp's OEIS Frontend

A261649 Expansion of Product_{k>=0} ((1+x^(3*k+1))/(1-x^(3*k+1)))^2.

Table of values

List of values

A261649 Expansion of Product_{k>=0} ((1+x^(3k+1))/(1-x^(3k+1)))^2.