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Search: id:A049686
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| 0, 7, 329, 15456, 726103, 34111385, 1602508992, 75283811239, 3536736619241, 166151337293088, 7805576116155895, 366695926122033977, 17226902951619441024, 809297742799991694151, 38019767008647990184073
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Tanya Khovanova, Recursive Sequences
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FORMULA
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a(n) = 47*a(n-1) - a(n-2), n>1. a(0)=0, a(1)=7. G.f.: 7*x/(1-47*x+x^2).
a(n)=-(1/15)*sqrt(5)*[47/2-(21/2)*sqrt(5)]^n+(1/15)*[47/2+(21/2)*sqrt(5)]^n*sqrt(5), with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Oct 07 2008]
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CROSSREFS
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A049686(n) = A004187(2n).
Sequence in context: A109059 A002000 A092588 this_sequence A160432 A009587 A054325
Adjacent sequences: A049683 A049684 A049685 this_sequence A049687 A049688 A049689
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KEYWORD
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nonn,easy
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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Better description and more terms from Michael Somos
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