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A022235
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Gaussian binomial coefficients [ n,6 ] for q = 7.
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1
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1, 137257, 16484565700, 1945063360640100, 228930106321885702602, 26935000671139346639437914, 3168902828959544132129870582100, 372818701621367349292382501162685300, 43861755035533826577243997768793428552803
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OFFSET
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6,2
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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..6} (7^(n-i+1)-1)/(7^i-1), by definition. - Vincenzo Librandi, Aug 06 2016
G.f.: x^6/((1 - x)*(1 - 7*x)*(1 - 49*x)*(1 - 343*x)*(1 - 2401*x)*(1 - 16807*x)*(1 - 117649*x)). - Ilya Gutkovskiy, Aug 06 2016
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MATHEMATICA
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PROG
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(Sage) [gaussian_binomial(n, 6, 7) for n in range(6, 15)] # Zerinvary Lajos, May 27 2009
(Magma) r:=6; q:=7; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // Vincenzo Librandi, Aug 06 2016
(PARI) r=6; q=7; for(n=r, 30, print1(prod(j=1, r, (1-q^(n-j+1))/(1-q^j)), ", ")) \\ G. C. Greubel, Jun 13 2018
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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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