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Search: id:A084328
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| A084328 |
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a(0)=0 a(1)=1 a(n)=13a(n-1)-11a(n-2). |
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+0
1
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| 0, 1, 13, 158, 1911, 23105, 279344, 3377317, 40832337, 493669894, 5968552915, 72160819061, 872436565728, 10547906344793, 127525980259301, 1541810773578190, 18640754273664159, 225369887048273977
(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)=(1/5)*sum(k=0, n, binomial(n, k)*F(5*k)) where F(k) denotes the k-th Fibonacci number.
a(n)=-(1/25)*[13/2-(5/2)*sqrt(5)]^n*sqrt(5)+(1/25)*sqrt(5)*[13/2+(5/2)*sqrt(5)]^n, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jun 19 2008
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PROGRAM
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(PARI) a(n)=(1/5)*sum(k=0, n, binomial(n, k)*fibonacci(5*k))
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CROSSREFS
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Cf. A030191.
Sequence in context: A125470 A016125 A015470 this_sequence A000830 A118673 A133180
Adjacent sequences: A084325 A084326 A084327 this_sequence A084329 A084330 A084331
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 21 2003
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