A180608 - cp's OEIS frontend

A180608 O.g.f.: exp( Sum_{n>=1} A067692(n)*x^n/n ), where A067692(n) = [sigma(n)^2 + sigma(n,2)]/2.

n	a(n)
0	1
1	1
2	4
3	8
4	21
5	39
6	93
7	171
8	364
9	675
10	1338
11	2433
12	4641
13	8282
14	15222
15	26811
16	47920
17	83046
18	145288
19	248164
20	425970
21	718303
22	1213106
23	2020540
24	3365352
25	5541996
26	9115640
27	14856657
28	24164430
29	39002462
30	62800603
31	100454208
32	160257140

[1, 1, 4, 8, 21, 39, 93, 171, 364, 675, 1338, 2433, 4641, 8282, 15222, 26811, 47920, 83046, 145288, 248164, 425970, 718303, 1213106, 2020540, 3365352, 5541996, 9115640, 14856657, 24164430, 39002462, 62800603, 100454208, 160257140]

cp's OEIS Frontend

A180608 O.g.f.: exp( Sum_{n>=1} A067692(n)*x^n/n ), where A067692(n) = [sigma(n)^2 + sigma(n,2)]/2.

Table of values

List of values