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 A274646 Number of linear extensions of the one-level grid poset G[(3^n), (0^(n-1)), (0^(n-1))]. 0
 1, 70, 26599, 29609650, 72574079902, 332014782982540, 2545213373338499072, 30302687687176712355840, 529556871638491591748878336, 13004213964445490176628310933504, 433440210434110194677894532074307584 (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 one-level grid poset G[(0^n), (0^(n-1)), (0^(n-1))] is given by Catalan number A000108(n), 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) and number of linear extensions of the one-level grid poset G[(2^n), (0^(n-1)), (0^(n-1))] is given by A274645(n). LINKS Ran Pan, Problem 1, Project P. CROSSREFS Cf. A000108, A274644, A274645. Sequence in context: A177637 A145410 A177638 * A005983 A200313 A177642 Adjacent sequences:  A274643 A274644 A274645 * A274647 A274648 A274649 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.)