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Search: id:A082395
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| A082395 |
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Number of shifted Young tableaux with height <= 3. |
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+0
2
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| 1, 1, 2, 3, 6, 12, 27, 63, 154, 386, 989, 2574, 6787, 18085, 48622, 131719, 359194, 985186, 2715973, 7521568, 20915257, 58373587, 163462816, 459136810, 1293223231, 3651864607, 10336625732, 29321683083, 83344398534, 237344961292
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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Fouad Ibn-Majdoub-Hassani. Combinatoire de polyominos et des tableaux decales oscillants . These de Doctorat. Laboratoire de Recherche en Informatique, Universite Paris-Sud XI, France.
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FORMULA
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a(n) = Sum_{k=1..n}(-1)^(k+1)*binomial(n, k)*binomial(k-1, floor(k/2)). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 18 2003
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CROSSREFS
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Partial sums of A005043.
Adjacent sequences: A082392 A082393 A082394 this_sequence A082396 A082397 A082398
Sequence in context: A024422 A019525 A108915 this_sequence A061343 A057649 A104872
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KEYWORD
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nonn
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AUTHOR
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Fouad IBN MAJDOUB HASSANI (fouad.ibnmajdoubhassani(AT)wanadoo.fr), Apr 14 2003
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 18 2003
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