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A048502
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a(n) = 2^(n-1)*(9*n-16)+9.
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1
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1, 2, 13, 53, 169, 473, 1225, 3017, 7177, 16649, 37897, 85001, 188425, 413705, 901129, 1949705, 4194313, 8978441, 19136521, 40632329, 85983241, 181403657, 381681673, 801112073, 1677721609, 3506438153, 7314866185, 15233712137, 31675383817, 65766686729
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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) = T(8, n), array T given by A048494.
G.f.: (1-3*x+11*x^2) / ((1-x)*(1-2*x)^2). - Colin Barker, Aug 24 2016
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MAPLE
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MATHEMATICA
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PROG
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(PARI) Vec((1-3*x+11*x^2)/((1-x)*(1-2*x)^2) + O(x^40)) \\ Colin Barker, Aug 24 2016
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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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EXTENSIONS
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STATUS
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approved
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