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A130885
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3n^3 - 2n^2 + n - 1.
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1
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1, 17, 65, 163, 329, 581, 937, 1415, 2033, 2809, 3761, 4907, 6265, 7853, 9689, 11791, 14177, 16865, 19873, 23219, 26921, 30997, 35465, 40343, 45649, 51401, 57617, 64315, 71513, 79229, 87481, 96287, 105665, 115633, 126209, 137411
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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+13*x+3*x^2+x^3)/(-1+x)^4. - R. J. Mathar, Nov 14 2007
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MATHEMATICA
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LinearRecurrence[{4, -6, 4, -1}, {1, 17, 65, 163}, 40] (* Harvey P. Dale, Nov 21 2019 *)
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PROG
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(Magma)[3*n^3-2*n^2+n-1: n in [1..40]]; /* or */ I:=[1, 17, 65, 163]; [n le 4 select I[n] else 4*Self(n-1)-6*Self(n-2)+4*Self(n-3)-Self(n-4): n in [1..40]]; // Vincenzo Librandi, Feb 12 2013
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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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