

A274763


Number of linear extensions of the onelevel grid poset G[(1^n), (1^(n1)), (0^(n1))].


2



1, 10, 215, 7200, 328090, 18914190, 1318595475, 107813147200, 10112867995550, 1070215246700100, 126122386636230944, 16378717184245442560, 2323753119238888095744, 357594668486650176208896, 59323244552378855471448064
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OFFSET

1,2


COMMENTS

The definition of a onelevel grid poset can be found in the Pan links. The number of linear extensions of the onelevel grid poset G[(0^n), (0^(n1)), (0^(n1))] is given by Catalan number A000108(n) and the number of linear extensions of the onelevel grid poset G[(1^n), (0^(n1)), (0^(n1))] is given by A274644(n).


LINKS

Table of n, a(n) for n=1..15.
Ran Pan, Problem 1, Project P.
Ran Pan, Algorithmic Solution to Problem 1 (and linear extensions of general onelevel gridlike posets), Project P.


CROSSREFS

Cf. A000108, A274644.
Sequence in context: A211912 A213788 A278125 * A002967 A243476 A305107
Adjacent sequences: A274760 A274761 A274762 * A274764 A274765 A274766


KEYWORD

nonn


AUTHOR

Ran Pan, Jul 05 2016


STATUS

approved



