A293953 Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type S_n joins.

1, 5, 169, 19241, 5216485, 2769073949, 2543467934449, 3712914075133121, 8094884285992309261, 25137521105896509819605, 107107542395866078895709049, 607546536582495444795794603801, 4474746926116218974619451907008885, 41907652406924609850893820950967654989

Offset: 0

Author

N. J. A. Sloane, Oct 29 2017

Keywords

• nonn

Links

• Lars Blomberg, Table of n, a(n) for n = 0..100
• Jeffrey Remmel, S. Zheng, Rises in forests of binary shrubs, arXiv preprint arXiv:1611.09018 [math.CO], 2016-2017.

Crossrefs

Cf. A293950, A293951, A293952.

Extensions

Terms a(11) and beyond from Lars Blomberg, Oct 31 2017