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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.

A205815 a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k) * 2^(n-k).

Table of values

n a(n)
1 1
2 17
3 136
4 1585
5 16986
6 282338
7 4784900
8 101750689
9 2359918963
10 62200943002
11 1792160567088
12 56765070059074
13 1946195069937314
14 72080471103535786
15 2862427829603121696
16 121449533922041845569
17 5480386857784931063958
18 262149577935595804303451

List of values

[1, 17, 136, 1585, 16986, 282338, 4784900, 101750689, 2359918963, 62200943002, 1792160567088, 56765070059074, 1946195069937314, 72080471103535786, 2862427829603121696, 121449533922041845569, 5480386857784931063958, 262149577935595804303451]

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

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