A195584 - cp's OEIS frontend

A195584 O.g.f.: exp( Sum_{n>=1} (sigma(2n^2)-sigma(n^2)) x^n/n ).

n	a(n)
0	1
1	2
2	6
3	18
4	42
5	102
6	238
7	522
8	1130
9	2394
10	4926
11	9978
12	19890
13	38942
14	75254
15	143598
16	270506
17	504126
18	929926
19	1698322
20	3074010
21	5516898
22	9820550
23	17349554
24	30430610
25	53007162
26	91734262
27	157771538
28	269734714
29	458542822
30	775281982
31	1303971722
32	2182227546
33	3634444634

[1, 2, 6, 18, 42, 102, 238, 522, 1130, 2394, 4926, 9978, 19890, 38942, 75254, 143598, 270506, 504126, 929926, 1698322, 3074010, 5516898, 9820550, 17349554, 30430610, 53007162, 91734262, 157771538, 269734714, 458542822, 775281982, 1303971722, 2182227546, 3634444634]

cp's OEIS Frontend

A195584 O.g.f.: exp( Sum_{n>=1} (sigma(2n^2)-sigma(n^2)) x^n/n ).

Table of values

List of values

cp's OEIS Frontend

A195584 O.g.f.: exp( Sum_{n>=1} (sigma(2*n^2)-sigma(n^2)) * x^n/n ).

Table of values

List of values

A195584 O.g.f.: exp( Sum_{n>=1} (sigma(2n^2)-sigma(n^2)) x^n/n ).