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Search: id:A015611
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| A015611 |
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a(n) = 12 a(n-1) + 7 a(n-2). |
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+0 1
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| 0, 1, 12, 151, 1896, 23809, 298980, 3754423, 47145936, 592032193, 7434407868, 93357119767, 1172326292280, 14721415345729, 184863268194708, 2321409125756599, 29150952386442144, 366061292517601921
(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)=(1/86)*sqrt(43)*{[6+sqrt(43)]^n-[6-sqrt(43)]^n}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 13 2009]
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PROGRAM
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(Other) sage: [lucas_number1(n, 12, -7) for n in xrange(0, 18)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 29 2009]
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CROSSREFS
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Sequence in context: A053507 A060917 A113358 this_sequence A127650 A103759 A121195
Adjacent sequences: A015608 A015609 A015610 this_sequence A015612 A015613 A015614
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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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