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A084328
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a(0)=0, a(1)=1; a(n) = 13*a(n-1) - 11*a(n-2).
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0
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0, 1, 13, 158, 1911, 23105, 279344, 3377317, 40832337, 493669894, 5968552915, 72160819061, 872436565728, 10547906344793, 127525980259301, 1541810773578190, 18640754273664159, 225369887048273977
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OFFSET
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0,3
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LINKS
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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.
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MATHEMATICA
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PROG
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(PARI) a(n)=(1/5)*sum(k=0, n, binomial(n, k)*fibonacci(5*k));
(Sage) [lucas_number1(n, 13, 11) for n in range(0, 18)] # Zerinvary Lajos, Apr 29 2009
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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