A279227 - cp's OEIS frontend

A279227 Expansion of Product_{k>=1} (1 + x^(k^2))^2/(1 - x^(k^2))^2.

n	a(n)
0	1
1	4
2	8
3	12
4	20
5	36
6	56
7	76
8	104
9	152
10	216
11	284
12	364
13	484
14	648
15	828
16	1028
17	1300
18	1664
19	2076
20	2532
21	3108
22	3848
23	4700
24	5640
25	6776
26	8200
27	9848
28	11660
29	13796
30	16424
31	19452
32	22776
33	26612
34	31240
35	36572
36	42440
37	49092
38	56968
39	66044
40	76040
41	87236
42	100280
43	115244

[1, 4, 8, 12, 20, 36, 56, 76, 104, 152, 216, 284, 364, 484, 648, 828, 1028, 1300, 1664, 2076, 2532, 3108, 3848, 4700, 5640, 6776, 8200, 9848, 11660, 13796, 16424, 19452, 22776, 26612, 31240, 36572, 42440, 49092, 56968, 66044, 76040, 87236, 100280, 115244]

cp's OEIS Frontend

A279227 Expansion of Product_{k>=1} (1 + x^(k^2))^2/(1 - x^(k^2))^2.

Table of values

List of values