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Search: id:A014993
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| 1, -10, 111, -1220, 13421, -147630, 1623931, -17863240, 196495641, -2161452050, 23775972551, -261535698060, 2876892678661, -31645819465270, 348104014117971, -3829144155297680, 42120585708274481
(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 ((-11)^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, -11) 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, A014994 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 16 2008]
Sequence in context: A103581 A087545 A078252 this_sequence A015592 A122574 A084031
Adjacent sequences: A014990 A014991 A014992 this_sequence A014994 A014995 A014996
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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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