A293952 Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type E_n joins.

1, 3, 99, 11259, 3052323, 1620265923, 1488257158851, 2172534146099019, 4736552519729393091, 14708695606607601165843, 62671742039942099631403299, 355493170380387030721038571419, 2618304731622723256262677112102883, 24521387779014982719407393681918617443

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. A293950, A293951, A293953.

Sequence in context: A068420 A276188 A180350 * A303826 A128296 A037114

Adjacent sequences: A293949 A293950 A293951 * A293953 A293954 A293955

Keyword

nonn

Author

N. J. A. Sloane, Oct 29 2017

Extensions

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

Status

approved