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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A279917 a(n) = Sum_{k=1..n-1} sigma_5(k)*sigma_7(n-k).

Table of values

n a(n)
1 0
2 1
3 162
4 6689
5 121250
6 1296406
7 9613604
8 54550049
9 252178758
10 992204376
11 3424910566
12 10615778966
13 30047257318
14 78751366604
15 193075366412
16 446840757793
17 982597838280
18 2066025009763
19 4171924730922
20 8127978871064
21 15324653827568
22 28059983210370

List of values

[0, 1, 162, 6689, 121250, 1296406, 9613604, 54550049, 252178758, 992204376, 3424910566, 10615778966, 30047257318, 78751366604, 193075366412, 446840757793, 982597838280, 2066025009763, 4171924730922, 8127978871064, 15324653827568, 28059983210370]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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