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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.

A030260 Number of nonisomorphic commutative groupoids with no idempotents.

Table of values

n a(n)
0 1
1 0
2 1
3 38
4 13872
5 83360520
6 10203847031340
7 31023254154131753920
8 2765562268014305034000397632
9 8332535835277886736134596954072281240
10 960864308045670310058158724983067048253497223280

List of values

[1, 0, 1, 38, 13872, 83360520, 10203847031340, 31023254154131753920, 2765562268014305034000397632, 8332535835277886736134596954072281240, 960864308045670310058158724983067048253497223280]

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

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