A320416 - cp's OEIS frontend

A320416 G.f.: exp( Sum_{n>=1} sigma_2(n)sigma_3(n)/sigma(n) x^n / n ), where sigma_{k}(n) equals the sum of the k-th powers of the divisors of n.

n	a(n)
0	1
1	1
2	8
3	31
4	110
5	380
6	1258
7	4145
8	13062
9	40549
10	123177
11	367524
12	1078214
13	3117641
14	8889005
15	25019907
16	69592393
17	191419803
18	521053616
19	1404437257
20	3750615009
21	9928671171
22	26065603448
23	67890853023
24	175503159857
25	450440887668
26	1148173347232
27	2907505610383
28	7316343339760
29	18299391020158
30	45503950232785
31	112518903733379

[1, 1, 8, 31, 110, 380, 1258, 4145, 13062, 40549, 123177, 367524, 1078214, 3117641, 8889005, 25019907, 69592393, 191419803, 521053616, 1404437257, 3750615009, 9928671171, 26065603448, 67890853023, 175503159857, 450440887668, 1148173347232, 2907505610383, 7316343339760, 18299391020158, 45503950232785, 112518903733379]

cp's OEIS Frontend

A320416 G.f.: exp( Sum_{n>=1} sigma_2(n)sigma_3(n)/sigma(n) x^n / n ), where sigma_{k}(n) equals the sum of the k-th powers of the divisors of n.

Table of values

List of values

cp's OEIS Frontend

A320416 G.f.: exp( Sum_{n>=1} sigma_2(n)*sigma_3(n)/sigma(n) * x^n / n ), where sigma_{k}(n) equals the sum of the k-th powers of the divisors of n.

Table of values

List of values

A320416 G.f.: exp( Sum_{n>=1} sigma_2(n)sigma_3(n)/sigma(n) x^n / n ), where sigma_{k}(n) equals the sum of the k-th powers of the divisors of n.