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A188475
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a(n) = (2*n^3 + 3*n^2 + n + 3)/3.
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4
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1, 3, 11, 29, 61, 111, 183, 281, 409, 571, 771, 1013, 1301, 1639, 2031, 2481, 2993, 3571, 4219, 4941, 5741, 6623, 7591, 8649, 9801, 11051, 12403, 13861, 15429, 17111, 18911, 20833, 22881, 25059, 27371, 29821, 32413, 35151, 38039, 41081, 44281, 47643
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OFFSET
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0,2
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COMMENTS
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Hankel transform of A137398(n+1) (conjecture).
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LINKS
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FORMULA
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G.f.: (1 - x + 5*x^2 - x^3)/(1-x)^4.
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MAPLE
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MATHEMATICA
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LinearRecurrence[{4, -6, 4, -1}, {1, 3, 11, 29}, 100] (* Vincenzo Librandi, Nov 25 2011 *)
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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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