A203320 - cp's OEIS frontend

A203320 G.f.: exp( Sum_{n>=1} x^n/n * exp( Sum_{k>=1} sigma(nk) x^(n*k)/k ) ).

n	a(n)
0	1
1	1
2	2
3	4
4	9
5	16
6	35
7	61
8	124
9	222
10	427
11	749
12	1434
13	2493
14	4585
15	8032
16	14511
17	25096
18	44791
19	77019
20	135435
21	232002
22	402957
23	685582
24	1181399
25	1998168
26	3410288
27	5741978
28	9726821
29	16286497
30	27409625
31	45672026
32	76378731
33	126706567
34	210690588
35	347954716
36	575685559
37	946756712

[1, 1, 2, 4, 9, 16, 35, 61, 124, 222, 427, 749, 1434, 2493, 4585, 8032, 14511, 25096, 44791, 77019, 135435, 232002, 402957, 685582, 1181399, 1998168, 3410288, 5741978, 9726821, 16286497, 27409625, 45672026, 76378731, 126706567, 210690588, 347954716, 575685559, 946756712]

cp's OEIS Frontend

A203320 G.f.: exp( Sum_{n>=1} x^n/n * exp( Sum_{k>=1} sigma(nk) x^(n*k)/k ) ).

Table of values

List of values

cp's OEIS Frontend

A203320 G.f.: exp( Sum_{n>=1} x^n/n * exp( Sum_{k>=1} sigma(n*k) * x^(n*k)/k ) ).

Table of values

List of values

A203320 G.f.: exp( Sum_{n>=1} x^n/n * exp( Sum_{k>=1} sigma(nk) x^(n*k)/k ) ).