A319362 - cp's OEIS frontend

A319362 a(n) = [x^n] exp(Sum_{k>=1} sigma(nk)x^k/k).

n	a(n)
0	1
1	1
2	8
3	39
4	385
5	917
6	31247
7	22527
8	1081986
9	2464860
10	50099635
11	14931071
12	19684696065
13	394805109
14	82267017929
15	496514888157
16	11386442827781
17	284625019799
18	3469798073972537
19	7725084195239
20	136470024990370842
21	28400489198168457
22	241211623942678951
23	5776331152550399

[1, 1, 8, 39, 385, 917, 31247, 22527, 1081986, 2464860, 50099635, 14931071, 19684696065, 394805109, 82267017929, 496514888157, 11386442827781, 284625019799, 3469798073972537, 7725084195239, 136470024990370842, 28400489198168457, 241211623942678951, 5776331152550399]

cp's OEIS Frontend

A319362 a(n) = [x^n] exp(Sum_{k>=1} sigma(nk)x^k/k).

Table of values

List of values

cp's OEIS Frontend

A319362 a(n) = [x^n] exp(Sum_{k>=1} sigma(n*k)*x^k/k).

Table of values

List of values

A319362 a(n) = [x^n] exp(Sum_{k>=1} sigma(nk)x^k/k).