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A274644 Number of linear extensions of the one-level grid poset G[(1^n), (0^(n-1)), (0^(n-1))]. 5
1, 6, 71, 1266, 30206, 902796, 32420011, 1359292626, 65164480466, 3515569641156, 210779736073446, 13903319821066836, 1000559812125494272, 78012524487061307392, 6550837823204595073024, 589404446176366091567104, 56568586570039156279345152, 5768723174387470083567910912, 622900652040379384928709640192 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..19.

Ran Pan, Problem 1, Project P.

Ran Pan, Algorithmic Solution to Problem 1 (and linear extensions of general one-level grid-like posets), Project P.

CROSSREFS

Cf. A000108.

Sequence in context: A186658 A092085 A028844 * A145089 A218676 A127135

Adjacent sequences:  A274641 A274642 A274643 * A274645 A274646 A274647

KEYWORD

nonn

AUTHOR

Ran Pan, Jun 30 2016

STATUS

approved

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Last modified September 26 06:54 EDT 2017. Contains 292502 sequences.