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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.

A351730 Number of labeled idempotent semigroups of order n.

Original entry on oeis.org

1, 1, 4, 35, 604, 16727, 681232, 38187291, 2810370122, 261999605819
Offset: 0

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Author

Andrew Howroyd, Feb 17 2022

Keywords

Comments

a(n) is also the number of labeled idempotent monoids of order n+1 with a fixed identity.

Crossrefs

Main diagonal of A058166 and A058158.
Cf. A023814, A058112 (isomorphism classes), A351731.

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