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

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

Offset

1,4

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.

Links

Table of n, a(n) for n=1..14.

Crossrefs

Cf. A377408 (semidistributive lattices), A006982 (distributive lattices).

Sequence in context: A164039 A362549 A014137 * A245158 A245159 A245160

Adjacent sequences: A377406 A377407 A377408 * A377410 A377411 A377412

Keyword

nonn,more

Author

Ludovic Schwob, Oct 27 2024

Status

approved