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Search: id:A061924
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| A061924 |
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Number of combinations in card games with 4 suits and 4 players. |
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+0
2
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| 1, 4, 56, 1320, 43680, 1860480, 96909120, 5967561600, 424097856000, 34162713446400, 3075990524006400, 306135476264217600, 33371339479827148800, 3954242643911239680000
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,100
F. Ellermann, Illustration for A001400, A061924
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FORMULA
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a(n) = (4*n)! / (4*n-n)!
E.g.f. in Maple notation: hypergeom([1/2, 1/4, 3/4], [1/3, 2/3], 256*x/27). - Karol A. Penson (penson(AT)lptl.jussieu.fr), Oct 18 2001
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EXAMPLE
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a(13)= 52*51*50*49*48*47*46*45*44*43*42*41*40 (Whist, Bridge)
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PROGRAM
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(PARI) { for (n=0, 100, write("b061924.txt", n, " ", (4*n)! / (4*n - n)!) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 29 2009]
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CROSSREFS
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A001400.
Sequence in context: A111874 A078533 A009058 this_sequence A009536 A009558 A113583
Adjacent sequences: A061921 A061922 A061923 this_sequence A061925 A061926 A061927
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KEYWORD
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nonn,easy
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AUTHOR
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(Frank.Ellermann(AT)t-online.de), May 16 2001
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