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