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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.

A032181 Number of ways to partition n labeled elements into pie slices each of at least 2 elements.

Table of values

n a(n)
1 0
2 1
3 1
4 4
5 11
6 56
7 267
8 1730
9 11643
10 93532
11 804563
12 7789838
13 81109107
14 923080328
15 11250876171
16 147433014058
17 2056359699659
18 30514968348500
19 479058943716579
20 7942752339181286
21 138576460230586755
22 2539126631897727808
23 48733588613803358939

List of values

[0, 1, 1, 4, 11, 56, 267, 1730, 11643, 93532, 804563, 7789838, 81109107, 923080328, 11250876171, 147433014058, 2056359699659, 30514968348500, 479058943716579, 7942752339181286, 138576460230586755, 2539126631897727808, 48733588613803358939]

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

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