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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 Ran Pan, Problem 1, 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 October 13 19:35 EDT 2019. Contains 327981 sequences. (Running on oeis4.)