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A022227
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Gaussian binomial coefficients [ n,9 ] for q = 6.
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1
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1, 12093235, 125354001240655, 1269155234987097152695, 12800037205947411879866507815, 129011474730413928552335877184470727, 1300166289917858220549677344211755721874055
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OFFSET
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9,2
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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^9/((1-x)*(1-6*x)*(1-36*x)*(1-216*x)*(1-1296*x)*(1-7776*x)*(1-46656*x)*(1-279936*x)*(1-1679616*x)*(1-10077696*x)). - Vincenzo Librandi, Aug 12 2016
a(n) = Product_{i=1..9} (6^(n-i+1)-1)/(6^i-1), by definition. - Vincenzo Librandi, Aug 12 2016
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MATHEMATICA
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PROG
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(Sage) [gaussian_binomial(n, 9, 6) for n in range(9, 16)] # Zerinvary Lajos, May 25 2009
(Magma) r:=9; q:=6; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // Vincenzo Librandi, Aug 12 2016
(PARI) r=9; q=6; 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,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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