A377408 Number of unlabeled semidistributive lattices with n elements.

1, 1, 1, 2, 4, 9, 22, 60, 174, 534, 1720, 5767, 20013, 71546

Offset

1,4

Comments

The smallest semidistributive lattice that is not congruence-uniform has 14 elements.

Links

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

H. Mühle, On the lattice property of shard orders, arXiv:1708.02104 [math.CO], 2017.

Crossrefs

Cf. A006982 (distributive lattices), A292790 (congruence-uniform lattices).

Sequence in context: A293854 A271078 A292790 * A278691 A159329 A159334

Adjacent sequences: A377405 A377406 A377407 * A377409 A377410 A377411

Keyword

nonn,more

Author

Ludovic Schwob, Oct 27 2024

Status

approved