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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.

A205812 a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k).

Table of values

n a(n)
1 1
2 11
3 70
4 719
5 7806
6 122534
7 2097278
8 43444159
9 1000262653
10 25997950846
11 743008372734
12 23312187863054
13 793714773262334
14 29197324076701078
15 1152921975865606140
16 48663045048486723199
17 2185911559738696663038
18 104128351926393946602653
19 5242880000000000000524286

List of values

[1, 11, 70, 719, 7806, 122534, 2097278, 43444159, 1000262653, 25997950846, 743008372734, 23312187863054, 793714773262334, 29197324076701078, 1152921975865606140, 48663045048486723199, 2185911559738696663038, 104128351926393946602653, 5242880000000000000524286]

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

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