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A293953 Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type S_n joins. 4
1, 5, 169, 19241, 5216485, 2769073949, 2543467934449, 3712914075133121, 8094884285992309261, 25137521105896509819605, 107107542395866078895709049, 607546536582495444795794603801, 4474746926116218974619451907008885, 41907652406924609850893820950967654989 (list; graph; refs; listen; history; text; internal format)
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, A293952.

Sequence in context: A288352 A301949 A316709 * A264013 A326555 A279382

Adjacent sequences:  A293950 A293951 A293952 * A293954 A293955 A293956

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 29 2017

EXTENSIONS

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

STATUS

approved

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Last modified January 25 15:34 EST 2022. Contains 350572 sequences. (Running on oeis4.)