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Search: id:A014994
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| 1, -11, 133, -1595, 19141, -229691, 2756293, -33075515, 396906181, -4762874171, 57154490053, -685853880635, 8230246567621, -98762958811451, 1185155505737413, -14221866068848955, 170662392826187461
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = a(n-1) + q^(n-1) = (q^n - 1) / (q - 1)
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MAPLE
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a:=n->sum ((-12)^j, j=0..n): seq(a(n), n=0..25); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 16 2008]
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PROGRAM
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(Other) sage: [gaussian_binomial(n, 1, -12) for n in xrange(1, 18)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 28 2009]
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CROSSREFS
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A077925, A014983, A014985, A014986, A014987, A014989, A014990, A014991, A014992, A014993 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 16 2008]
Sequence in context: A158536 A105280 A051431 this_sequence A015609 A157773 A024143
Adjacent sequences: A014991 A014992 A014993 this_sequence A014995 A014996 A014997
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KEYWORD
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sign,easy
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AUTHOR
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Olivier Gerard (olivier.gerard(AT)gmail.com)
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