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 A274645 Number of linear extensions of the one-level grid poset G[(2^n), (0^(n-1)), (0^(n-1))]. 1
 1, 20, 1301, 177260, 41385102, 14760468600, 7465847167005, 5083351577582300, 4483012419041095680, 4971032496120058085376, 6769339545226095791964160, 11105730970797793499164966912, 21604722570792867452576610648064 (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 the Catalan number A000108(n) and the number of linear extensions of the one-level grid poset G[(1^n), (0^(n-1)), (0^(n-1))] is given by A274644(n). LINKS Ran Pan, Problem 1, Project P. CROSSREFS Cf. A000108, A274644. Sequence in context: A174581 A153469 A160253 * A005982 A229476 A177597 Adjacent sequences:  A274642 A274643 A274644 * A274646 A274647 A274648 KEYWORD nonn AUTHOR Ran Pan, Jun 30 2016 STATUS approved

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Last modified November 18 12:04 EST 2018. Contains 317304 sequences. (Running on oeis4.)