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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.

A377331 a(n) = Sum_{k=1..n} binomial(n,k) * sigma(k,n).

Table of values

n a(n)
1 1
2 7
3 58
4 707
5 11186
6 219202
7 5097205
8 137036819
9 4179577045
10 142539843882
11 5374034016858
12 221930535785918
13 9962431381720780
14 482997720973917947
15 25151350530268841003
16 1400042027334939211235
17 82960609980815501293708
18 5213812927633674297808237
19 346394632975721545946690108

List of values

[1, 7, 58, 707, 11186, 219202, 5097205, 137036819, 4179577045, 142539843882, 5374034016858, 221930535785918, 9962431381720780, 482997720973917947, 25151350530268841003, 1400042027334939211235, 82960609980815501293708, 5213812927633674297808237, 346394632975721545946690108]

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

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