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A087426
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a(n) = S(n,4) where S(n,m) = sum(k=0,n,binomial(n,k)*Fibonacci(m*k)).
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0
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0, 3, 27, 216, 1701, 13365, 104976, 824499, 6475707, 50860872, 399466485, 3137450517, 24641856288, 193539651939, 1520080160859, 11938864580280, 93769059774789, 736471756750581, 5784324272782128, 45430672644283923
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 9*a(n-1)-9*a(n-2).
a(n) = (1/sqrt(5))*(((9+3*sqrt(5))/2)^n-((9-3*sqrt(5))/2)^n).
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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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