A332082 - cp's OEIS frontend

A332082 a(n) = Sum_{1 <= m <= n} Sum_{1 <= k <= n+1-m} m*R(k,n+1), where R(k,b) = (b^k - 1)/(b - 1) is the base-b repunit of length k.

n	a(n)
0	0
1	1
2	7
3	42
4	295
5	2675
6	31122
7	447188
8	7661370
9	152415765
10	3452271185
11	87693358654
12	2468455488681
13	76256200336407
14	2564715882332660
15	93281313241869480
16	3647955866777821668
17	152635100350763019705
18	6803550294289868214315
19	321844061970058547739730
20	16103630469426364324556635

[0, 1, 7, 42, 295, 2675, 31122, 447188, 7661370, 152415765, 3452271185, 87693358654, 2468455488681, 76256200336407, 2564715882332660, 93281313241869480, 3647955866777821668, 152635100350763019705, 6803550294289868214315, 321844061970058547739730, 16103630469426364324556635]

cp's OEIS Frontend

A332082 a(n) = Sum_{1 <= m <= n} Sum_{1 <= k <= n+1-m} m*R(k,n+1), where R(k,b) = (b^k - 1)/(b - 1) is the base-b repunit of length k.

Table of values

List of values