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A015027
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q-factorial numbers for q=-12.
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1
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1, -11, -1463, 2333485, 44665236385, -10259202810507035, -28277368892180867021255, 935288538953861649874525071325, 371221802129246962654056875248358359825, -1768082733073463162105209099485375242162416580075
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OFFSET
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1,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..40
Index entries for sequences related to factorial numbers
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FORMULA
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Prod_{k=1}^{n} (q^k - 1) / (q - 1).
a(1) = 1, a(n) = ((-12)^n -1)*a(n-1)/(-13). - Vincenzo Librandi, Oct 26 2012
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MATHEMATICA
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RecurrenceTable[{a[1]==1, a[n]==(((-12)^n - 1) * a[n-1])/(-13)}, a, {n, 15}] (* Vincenzo Librandi, Oct 26 2012 *)
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PROG
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(MAGMA) [n le 1 select 1 else ((-12)^n - 1)*Self(n-1)/(-13): n in [1..13]]; // Vincenzo Librandi, Oct 26 2012
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CROSSREFS
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Sequence in context: A110195 A015484 A145185 * A160264 A076168 A053884
Adjacent sequences: A015024 A015025 A015026 * A015028 A015029 A015030
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KEYWORD
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sign,easy
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AUTHOR
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Olivier Gérard
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STATUS
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approved
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