A058112 Number of isomorphism classes of idempotent semigroups of order n.
1, 1, 3, 10, 46, 251, 1682, 13213, 119826, 1228712
Offset: 0
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Updated Feb 19 2001
a(8)-a(9) added by Andrew Howroyd, Feb 17 2022
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.