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A131474
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a(n) = ceiling(n/2)*ceiling(n^2/2).
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10
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0, 1, 2, 10, 16, 39, 54, 100, 128, 205, 250, 366, 432, 595, 686, 904, 1024, 1305, 1458, 1810, 2000, 2431, 2662, 3180, 3456, 4069, 4394, 5110, 5488, 6315, 6750, 7696, 8192, 9265, 9826, 11034, 11664, 13015, 13718, 15220, 16000, 17661
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OFFSET
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0,3
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LINKS
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FORMULA
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G.f.: x*(1 + x + 5*x^2 + 2*x^4 + 3*x^3)/((1+x)^3*(x-1)^4).
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PROG
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(Magma) [Ceiling(n/2)*Ceiling(n^2/2) : n in [0..50]]; // Vincenzo Librandi, Oct 01 2011
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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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