A361959 Number of connected unlabeled tiered posets with n elements.

1, 1, 1, 3, 8, 25, 83, 330, 1538, 8834, 63723, 591313, 7180087, 115411088, 2472336977, 70840464484, 2720170935989, 140167035897433, 9702508891845883, 903305670556552694, 113233954374954246849, 19137449587197829494989, 4366006746295284220605007

Offset: 0

Author

Andrew Howroyd, Apr 03 2023

Keywords

• nonn

Comments

A tiered poset is a partially ordered set in which every maximal chain has the same length.

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..40

Crossrefs

Row sums of A361958.

Cf. A361912 (not necessarily connected).

Programs

PARI

\\ See PARI link in A361957 for program code.
A361959seq(20) \\ Andrew Howroyd, Apr 03 2023