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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.

A331957 Number of rooted chains in set partitions of {1, 2, ..., n}.

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 64
5 872
6 18024
7 525520
8 20541392
9 1036555120
10 65591856032
11 5085891210864
12 474213645013904
13 52346708185187392
14 6751386193135966464
15 1005991884967386086400
16 171500271138273300946720
17 33167303833191421470542496
18 7222314392966179538774364128
19 1759036134944451206655721276256

List of values

[1, 1, 2, 8, 64, 872, 18024, 525520, 20541392, 1036555120, 65591856032, 5085891210864, 474213645013904, 52346708185187392, 6751386193135966464, 1005991884967386086400, 171500271138273300946720, 33167303833191421470542496, 7222314392966179538774364128, 1759036134944451206655721276256]

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

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