A259694 - cp's OEIS frontend

A259694 a(n) = Sum(k^6sigma(k)sigma(n-k),k=1..n-1).

n	a(n)
1	0
2	1
3	195
4	3496
5	38195
6	192780
7	977386
8	3216320
9	9860049
10	27321870
11	65803045
12	144005856
13	308944925
14	635774072
15	1112550390
16	2153146880
17	3618341556
18	6391671525
19	9949570455
20	16725562160
21	24691972080
22	40979569092
23	56807498030
24	89450231040
25	120404165825

[0, 1, 195, 3496, 38195, 192780, 977386, 3216320, 9860049, 27321870, 65803045, 144005856, 308944925, 635774072, 1112550390, 2153146880, 3618341556, 6391671525, 9949570455, 16725562160, 24691972080, 40979569092, 56807498030, 89450231040, 120404165825]

cp's OEIS Frontend

A259694 a(n) = Sum(k^6sigma(k)sigma(n-k),k=1..n-1).

Table of values

List of values

cp's OEIS Frontend

A259694 a(n) = Sum(k^6*sigma(k)*sigma(n-k),k=1..n-1).

Table of values

List of values

A259694 a(n) = Sum(k^6sigma(k)sigma(n-k),k=1..n-1).