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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.

A309911 a(n) = Sum_{k=1..n} Stirling2(n,k) * floor(n/k).

Table of values

n a(n)
1 1
2 3
3 7
4 25
5 71
6 360
7 1310
8 7195
9 35740
10 213318
11 1132154
12 8409475
13 50344672
14 366939569
15 2728237607
16 21375289293
17 159969524749
18 1462761108082
19 11896122581676
20 107011124829787
21 1031744001100166
22 9684995830526129
23 91735916202054984
24 1010641832989185386
25 10131466944871497886

List of values

[1, 3, 7, 25, 71, 360, 1310, 7195, 35740, 213318, 1132154, 8409475, 50344672, 366939569, 2728237607, 21375289293, 159969524749, 1462761108082, 11896122581676, 107011124829787, 1031744001100166, 9684995830526129, 91735916202054984, 1010641832989185386, 10131466944871497886]

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

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