A215603 - cp's OEIS frontend

A215603 O.g.f.: exp( Sum_{n>=1} -(sigma(2n^2) - sigma(n^2)) (-x)^n/n ).

n	a(n)
0	1
1	2
2	-2
3	2
4	10
5	-10
6	6
7	10
8	-22
9	58
10	-58
11	10
12	114
13	-210
14	270
15	-242
16	74
17	382
18	-930
19	1474
20	-1542
21	1010
22	446
23	-2798
24	5682
25	-7718
26	8030
27	-5182
28	-998
29	11126
30	-23802
31	35626
32	-42246
33	39450
34	-20810
35	-15546
36	69514
37	-133770
38	194918
39	-234106
40	227410
41	-147706
42	-19738
43	282234

[1, 2, -2, 2, 10, -10, 6, 10, -22, 58, -58, 10, 114, -210, 270, -242, 74, 382, -930, 1474, -1542, 1010, 446, -2798, 5682, -7718, 8030, -5182, -998, 11126, -23802, 35626, -42246, 39450, -20810, -15546, 69514, -133770, 194918, -234106, 227410, -147706, -19738, 282234]

cp's OEIS Frontend

A215603 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

A215603 O.g.f.: exp( Sum_{n>=1} -(sigma(2*n^2) - sigma(n^2)) * (-x)^n/n ).

Table of values

List of values

A215603 O.g.f.: exp( Sum_{n>=1} -(sigma(2n^2) - sigma(n^2)) (-x)^n/n ).