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Search: id:A015287
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| A015287 |
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Gaussian binomial coefficient [ n,4 ] for q=-2. |
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+0
1
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| 1, 11, 231, 3311, 56287, 875007, 14208447, 225683007, 3624203583, 57881286463, 926949282623, 14824402656063, 237244744338239, 3795481554332479, 60731179948567359, 971671079497526079, 15546959673214593855
(list; graph; listen)
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OFFSET
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4,2
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REFERENCES
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J. Goldman and G.-C. Rota, The number of subspaces of a vector space, pp. 75-83 of W. T. Tutte, editor, Recent Progress in Combinatorics. Academic Press, NY, 1969.
I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p, 99.
M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.
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PROGRAM
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(Other) sage: [gaussian_binomial(n, 4, -2) for n in xrange(4, 21)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 27 2009]
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CROSSREFS
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Sequence in context: A108518 A077736 A068122 this_sequence A045757 A144773 A061115
Adjacent sequences: A015284 A015285 A015286 this_sequence A015288 A015289 A015290
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KEYWORD
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nonn,easy
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AUTHOR
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Olivier Gerard (olivier.gerard(AT)gmail.com)
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