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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.

A185003 a(n) = Sum_{k=1..n} binomial(n,k)*sigma(k).

Table of values

n a(n)
1 1
2 5
3 16
4 45
5 116
6 284
7 673
8 1557
9 3535
10 7910
11 17502
12 38376
13 83500
14 180479
15 387881
16 829605
17 1766998
18 3749765
19 7931114
20 16724870
21 35173777
22 73794660
23 154485527
24 322771344
25 673155141
26 1401536934
27 2913490375
28 6047714599
29 12536770558
30 25956242579
31 53678385266

List of values

[1, 5, 16, 45, 116, 284, 673, 1557, 3535, 7910, 17502, 38376, 83500, 180479, 387881, 829605, 1766998, 3749765, 7931114, 16724870, 35173777, 73794660, 154485527, 322771344, 673155141, 1401536934, 2913490375, 6047714599, 12536770558, 25956242579, 53678385266]

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

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