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A015009
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q-factorial numbers for q=10.
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1
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1, 11, 1221, 1356531, 15072415941, 1674711207620451, 1860790044610366931061, 20675444733360738721748118771, 2297271634742810443154153338805764581, 2552524038347870310755413660544832496799359491, 28361378203581611893021499527080870668821235178133404501
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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) = (10^n - 1)*a(n-1)/9. - Vincenzo Librandi, Oct 26 2012
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MATHEMATICA
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RecurrenceTable[{a[1]==1, a[n]==((10^n-1) * a[n-1])/9}, 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)/9: n in [1..15]]; // Vincenzo Librandi, Oct 26 2012
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CROSSREFS
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Sequence in context: A180581 A019524 A078269 * A068326 A001323 A182553
Adjacent sequences: A015006 A015007 A015008 * A015010 A015011 A015012
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KEYWORD
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nonn,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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