cp's OEIS Frontend

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.

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A377409 Number of unlabeled join-semidistributive lattices with n elements.

Original entry on oeis.org

1, 1, 1, 2, 4, 9, 23, 65, 197, 636, 2171, 7756, 28822, 110805
Offset: 1

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Author

Ludovic Schwob, Oct 27 2024

Keywords

Comments

Equivalently, a(n) is the number of meet-semidistributive lattices with n elements.
The smallest join-semidistributive lattice that is not meet-semidistributive has 7 elements.

Crossrefs

Cf. A377408 (semidistributive lattices), A006982 (distributive lattices).
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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