A259410 - cp's OEIS frontend

A259410 a(n) = 1 - sigma(n) + sigma(n)^2 - sigma(n)^3 + sigma(n)^4.

n	a(n)
1	1
2	61
3	205
4	2101
5	1111
6	19141
7	3641
8	47461
9	26521
10	99451
11	19141
12	593461
13	35855
14	318505
15	318505
16	894661
17	99451
18	2255605
19	152381
20	3039331
21	1016801
22	1634221
23	318505
24	12747541
25	894661
26	3039331
27	2497561
28	9661961
29	783871
30	26505721
31	1016801
32	15506821
33	5200081

[1, 61, 205, 2101, 1111, 19141, 3641, 47461, 26521, 99451, 19141, 593461, 35855, 318505, 318505, 894661, 99451, 2255605, 152381, 3039331, 1016801, 1634221, 318505, 12747541, 894661, 3039331, 2497561, 9661961, 783871, 26505721, 1016801, 15506821, 5200081]

cp's OEIS Frontend

A259410 a(n) = 1 - sigma(n) + sigma(n)^2 - sigma(n)^3 + sigma(n)^4.

Table of values

List of values