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Search: id:A015572
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| A015572 |
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Linear 2nd order recurrence. |
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+0
1
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| 0, 1, 7, 61, 511, 4309, 36295, 305773, 2575951, 21700933, 182817943, 1540136797, 12974772895, 109305051829, 920832637543, 7757489084749, 65352415243759, 550556775723301, 4638126412988215, 39073566199597117
(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) = 7 a(n-1) + 12 a(n-2).
a(n)=(1/97)*sqrt(97)*[7/2+(1/2)*sqrt(97)]^n-(1/97)*sqrt(97)*[7/2-(1/2)*sqrt(97)]^n , with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jun 25 2008
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CROSSREFS
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Adjacent sequences: A015569 A015570 A015571 this_sequence A015573 A015574 A015575
Sequence in context: A129079 A135165 A104093 this_sequence A066443 A108448 A098659
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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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