A374978 - cp's OEIS frontend

A374978 a(n) = Sum_{i+j+k+l+m=n, i,j,k,l,m >= 1} sigma(i)sigma(j)sigma(k)sigma(l)sigma(m).

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	15
7	110
8	545
9	2095
10	6713
11	18750
12	47040
13	108185
14	231640
15	467034
16	894605
17	1639680
18	2891475
19	4929660
20	8155182
21	13135080
22	20651875
23	31770970
24	47923680
25	70989801
26	103454645
27	148464520
28	210155730
29	293558265
30	405325092
31	553175000
32	747508125
33	999747750

[0, 0, 0, 0, 1, 15, 110, 545, 2095, 6713, 18750, 47040, 108185, 231640, 467034, 894605, 1639680, 2891475, 4929660, 8155182, 13135080, 20651875, 31770970, 47923680, 70989801, 103454645, 148464520, 210155730, 293558265, 405325092, 553175000, 747508125, 999747750]

cp's OEIS Frontend

A374978 a(n) = Sum_{i+j+k+l+m=n, i,j,k,l,m >= 1} sigma(i)sigma(j)sigma(k)sigma(l)sigma(m).

Table of values

List of values

cp's OEIS Frontend

A374978 a(n) = Sum_{i+j+k+l+m=n, i,j,k,l,m >= 1} sigma(i)*sigma(j)*sigma(k)*sigma(l)*sigma(m).

Table of values

List of values

A374978 a(n) = Sum_{i+j+k+l+m=n, i,j,k,l,m >= 1} sigma(i)sigma(j)sigma(k)sigma(l)sigma(m).