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Search: id:A015529
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| A015529 |
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Linear 2nd order recurrence. |
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+0
1
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| 0, 1, 3, 20, 93, 499, 2520, 13049, 66867, 344140, 1767957, 9089411, 46715760, 240130801, 1234265763, 6344236100, 32609631693, 167615492179, 861552425160, 4428427689449, 22762359745107, 116999783819260
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n) = 3 a(n-1) + 11 a(n-2).
O.g.f.: -x/(-1+3*x+11*x^2). a(n)=-22^n*(A^n-B^n)/sqrt(53) where A=-1/(3+sqrt(53)) and B=1/(sqrt(53)-3) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 29 2008
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PROGRAM
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(Other) sage: [lucas_number1(n, 3, -11) for n in xrange(0, 22)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 22 2009]
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CROSSREFS
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Sequence in context: A006411 A129549 A092786 this_sequence A000948 A165960 A074831
Adjacent sequences: A015526 A015527 A015528 this_sequence A015530 A015531 A015532
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KEYWORD
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nonn,easy
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AUTHOR
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Olivier Gerard (olivier.gerard(AT)gmail.com)
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