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A022215
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Gaussian binomial coefficients [ n,8 ] for q = 5.
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1
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1, 488281, 198682027181, 78236053707784181, 30609934249224268600431, 11960833022875371081037525431, 4672499438759279108929231093087931, 1825218456001772231793929085435472462931, 712977784594148279816735342927316866304884806
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OFFSET
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8,2
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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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G.f.: x^8/((1-x)*(1-5*x)*(1-25*x)*(1-125*x)*(1-625*x)*(1-3125*x)*(1-15625*x)*(1-78125*x)*(1-390625*x)). - Vincenzo Librandi, Aug 10 2016
a(n) = Product_{i=1..8} (5^(n-i+1)-1)/(5^i-1), by definition. - Vincenzo Librandi, Aug 10 2016
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MATHEMATICA
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PROG
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(Sage) [gaussian_binomial(n, 8, 5) for n in range(8, 17)] # Zerinvary Lajos, May 25 2009
(Magma) r:=8; q:=5; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // Vincenzo Librandi, Aug 10 2016
(PARI) r=8; q=5; for(n=r, 30, print1(prod(j=1, r, (1-q^(n-j+1))/(1-q^j)), ", ")) \\ G. C. Greubel, Jun 08 2018
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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