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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.

A038017 Number of n-element commutative groupoids with an identity ("pointed" groupoids).

Table of values

n a(n)
1 1
2 2
3 15
4 720
5 409600
6 3920030472
7 775775333825891
8 3837862827737186253664
9 558740081065710564284870598075
10 2755731923933734753149997221152548428020
11 520996314135332606285488148844494695722050333912483

List of values

[1, 2, 15, 720, 409600, 3920030472, 775775333825891, 3837862827737186253664, 558740081065710564284870598075, 2755731923933734753149997221152548428020, 520996314135332606285488148844494695722050333912483]

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

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