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 A024487 a(n) = (1/(4n+2))*M(3n; n,n,n). 2
 1, 9, 120, 1925, 34398, 659736, 13302432, 278397405, 5996669250, 132166590270, 2967978162240, 67694635250424, 1564409223571600, 36561597688116000, 862822254602816640, 20535537339485077005, 492426552811873991850, 11886753074132473787250, 288645723487776840570000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Number of standard Young tableaux of shape (n,n,{1}^n). - Alois P. Heinz, Apr 05 2013 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..250 MAPLE with(combinat): a:= n-> multinomial(3*n, n\$3)/(4*n+2): seq(a(n), n=1..30);  # Alois P. Heinz, Apr 05 2013 CROSSREFS Sequence in context: A061172 A167593 A214698 * A002691 A157930 A017102 Adjacent sequences:  A024484 A024485 A024486 * A024488 A024489 A024490 KEYWORD nonn AUTHOR EXTENSIONS Corrected and extended by Alois P. Heinz, Apr 05 2013 STATUS approved

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Last modified June 19 17:25 EDT 2013. Contains 226415 sequences.