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A153873
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a(n) = 9*Fibonacci(2n+1) - 1.
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5
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8, 17, 44, 116, 305, 800, 2096, 5489, 14372, 37628, 98513, 257912, 675224, 1767761, 4628060, 12116420, 31721201, 83047184, 217420352, 569213873, 1490221268, 3901449932, 10214128529, 26740935656, 70008678440, 183285099665, 479846620556, 1256254762004, 3288917665457
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 3*a(n-1) - a(n-2) + 1.
a(n) = 4*a(n-1) - 4*a(n-2) + a(n-3).
a(n) = 3*a(n-1) - 3*a(n-3) + a(n-4).
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MATHEMATICA
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LinearRecurrence[{4, -4, 1}, {8, 17, 44}, 25] (* G. C. Greubel, Aug 31 2016 *)
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PROG
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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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