A382124 - cp's OEIS frontend

A382124 G.f. A(x) = exp( Sum_{n>=1} sigma(n)sigma(2n)/3 * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.

n	a(n)
0	1
1	1
2	4
3	9
4	22
5	44
6	105
7	200
8	425
9	825
10	1634
11	3072
12	5917
13	10846
14	20153
15	36436
16	65882
17	116831
18	207293
19	361502
20	629539
21	1083068
22	1856251
23	3150554
24	5328137
25	8933266
26	14920357
27	24745481
28	40869317
29	67089425
30	109697089
31	178379353
32	288953043
33	465805681
34	748079686
35	1196148976
36	1905801579
37	3024212984

[1, 1, 4, 9, 22, 44, 105, 200, 425, 825, 1634, 3072, 5917, 10846, 20153, 36436, 65882, 116831, 207293, 361502, 629539, 1083068, 1856251, 3150554, 5328137, 8933266, 14920357, 24745481, 40869317, 67089425, 109697089, 178379353, 288953043, 465805681, 748079686, 1196148976, 1905801579, 3024212984]

cp's OEIS Frontend

A382124 G.f. A(x) = exp( Sum_{n>=1} sigma(n)sigma(2n)/3 * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.

Table of values

List of values

cp's OEIS Frontend

A382124 G.f. A(x) = exp( Sum_{n>=1} sigma(n)*sigma(2*n)/3 * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.

Table of values

List of values

A382124 G.f. A(x) = exp( Sum_{n>=1} sigma(n)sigma(2n)/3 * x^n/n ), where sigma(n) = A000203(n) is the sum of the divisors of n.