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A048508
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a(n) = T(3,n), array T given by A048505.
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3
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1, 17, 58, 160, 408, 1000, 2392, 5624, 13048, 29944, 68088, 153592, 344056, 765944, 1695736, 3735544, 8191992, 17891320, 38928376, 84410360, 182452216, 393215992, 845152248, 1811939320, 3875536888, 8271167480, 17616076792
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OFFSET
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0,2
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COMMENTS
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n-th difference of a(n), a(n-1), ..., a(0) is (16, 25, 36, 49, 64, ...).
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LINKS
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FORMULA
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a(n) = (n+4)*(n+9) * 2^(n-2) - 8. - Ralf Stephan, Feb 05 2004
a(n) = 7*a(n-1)-18*a(n-2)+20*a(n-3)-8*a(n-4). - Colin Barker, Feb 25 2015
G.f.: (40*x^3-43*x^2+10*x+1) / ((x-1)*(2*x-1)^3). - Colin Barker, Feb 25 2015
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PROG
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(PARI) Vec((40*x^3-43*x^2+10*x+1) / ((x-1)*(2*x-1)^3) + O(x^100)) \\ Colin Barker, Feb 25 2015
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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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