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A022255
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Gaussian binomial coefficients [ n,4 ] for q = 9.
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1
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1, 7381, 49031983, 322140667123, 2113887057661126, 13869447829832637406, 90997618413507253345810, 597035499217287155085549610, 3917150001348391097251303957615, 25700421225173962543056800181928315, 168620463706718874134703442098874261321
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OFFSET
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4,2
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REFERENCES
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F. J. MacWilliams and N. J. A. Sloane, The Theory of Error-Correcting Codes, Elsevier-North Holland, 1978, p. 698.
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LINKS
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FORMULA
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a(n) = Product_{i=1..4} (9^(n-i+1)-1)/(9^i-1), by definition. - Vincenzo Librandi, Aug 04 2016
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MATHEMATICA
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PROG
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(Sage) [gaussian_binomial(n, 4, 9) for n in range(4, 15)] # Zerinvary Lajos, May 27 2009
(Magma) r:=4; q:=9; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // Vincenzo Librandi, Aug 04 2016
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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