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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.

A206766 a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k) * 3^(n-k).

Table of values

n a(n)
1 1
2 23
3 226
4 3039
5 33306
6 594902
7 10012010
8 220553599
9 5170061143
10 138942811678
11 4049569009674
12 130045043225838
13 4503599691290714
14 168477832912220134
15 6746676272050878036
16 288487396687082933759
17 13107200000016921588858
18 630907565930072760920429

List of values

[1, 23, 226, 3039, 33306, 594902, 10012010, 220553599, 5170061143, 138942811678, 4049569009674, 130045043225838, 4503599691290714, 168477832912220134, 6746676272050878036, 288487396687082933759, 13107200000016921588858, 630907565930072760920429]

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

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