A293950 Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type A_n joins.

1, 2, 40, 3194, 666160, 287316122, 222237912664, 280180369563194, 537546603651987424, 1490424231594917313242, 5735930050702709579598280, 29665120602262869704075225594, 200776204583497637546703088929040, 1739317344037357729592558320480494362

Offset

0,2

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. A293951, A293952, A293953.

Sequence in context: A052502 A209289 A246742 * A104134 A358160 A328553

Adjacent sequences: A293947 A293948 A293949 * A293951 A293952 A293953

Keyword

nonn

Author

N. J. A. Sloane, Oct 29 2017

Extensions

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

Status

approved