A319107 - cp's OEIS frontend

A319107 Expansion of Product_{k>=1} (1 + x^k)^(sigma_1(k)-k), where sigma_1(k) = sum of divisors of k (A000203).

n	a(n)
0	1
1	0
2	1
3	1
4	3
5	2
6	9
7	5
8	17
9	17
10	38
11	33
12	88
13	75
14	169
15	181
16	343
17	353
18	712
19	728
20	1348
21	1518
22	2591
23	2898
24	5025
25	5615
26	9259
27	10866
28	17160
29	20111
30	31775
31	37264
32	57130
33	68782
34	102663
35	123698
36	183793
37	221708
38	323077
39	395325
40	566079
41	693248
42	987086
43	1210110
44	1700074
45	2100674
46	2915549

[1, 0, 1, 1, 3, 2, 9, 5, 17, 17, 38, 33, 88, 75, 169, 181, 343, 353, 712, 728, 1348, 1518, 2591, 2898, 5025, 5615, 9259, 10866, 17160, 20111, 31775, 37264, 57130, 68782, 102663, 123698, 183793, 221708, 323077, 395325, 566079, 693248, 987086, 1210110, 1700074, 2100674, 2915549]

cp's OEIS Frontend

A319107 Expansion of Product_{k>=1} (1 + x^k)^(sigma_1(k)-k), where sigma_1(k) = sum of divisors of k (A000203).

Table of values

List of values