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A015025
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q-factorial numbers for q=-10.
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1
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1, -9, -819, 744471, 6767985861, -615270826637649, -559337171058846967059, 5084883322413411422459366631, 462262120681663158624798004859942421, -420238291486760860506028808179511473194550689
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OFFSET
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1,2
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LINKS
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FORMULA
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Prod_{k=1}^{n} (q^k - 1) / (q - 1).
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MATHEMATICA
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RecurrenceTable[{a[1]==1, a[n]==(((-10)^n - 1) * a[n-1])/(-11)}, a, {n, 15}] (* Vincenzo Librandi, Oct 26 2012 *)
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PROG
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(Magma) [n le 1 select 1 else ((-10)^n - 1)*Self(n-1)/(-11): n in [1..13]]; // Vincenzo Librandi, Oct 26 2012
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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