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A027017
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a(n) = T(2*n+1, n+2), T given by A027011.
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1
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1, 7, 73, 373, 1404, 4506, 13226, 36889, 99947, 266455, 704150, 1852212, 4860468, 12739243, 33369709, 87385081, 228803856, 599048334, 1568366942, 4106082685, 10749916175, 28143706267, 73681248938, 192900093288, 505019090664, 1322157246031, 3461452722961
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OFFSET
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1,2
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LINKS
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FORMULA
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G.f.: x*(1+43*x^2-31*x^3+17*x^4-7*x^5+x^6) / ((1-x)^4*(1-3*x+x^2)). - Colin Barker, Feb 19 2016
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PROG
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(PARI) Vec(x*(1+43*x^2-31*x^3+17*x^4-7*x^5+x^6)/((1-x)^4*(1-3*x+x^2)) + O(x^40)) \\ Colin Barker, Feb 19 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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STATUS
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approved
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