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A239426
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21*n^4 - 36*n^3 + 25*n^2 - 8*n + 1.
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4
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1, 3, 133, 931, 3441, 9211, 20293, 39243, 69121, 113491, 176421, 262483, 376753, 524811, 712741, 947131, 1235073, 1584163, 2002501, 2498691, 3081841, 3761563, 4547973, 5451691, 6483841, 7656051, 8980453, 10469683, 12136881, 13995691, 16060261, 18345243
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OFFSET
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0,2
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COMMENTS
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For n > 0: a(n) = A219069(2*n-1,n).
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LINKS
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FORMULA
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G.f.: ( -1+2*x-128*x^2-286*x^3-91*x^4 ) / (x-1)^5 . - R. J. Mathar, Mar 31 2014
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MATHEMATICA
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Table[(21 n^4 - 36 n^3 + 25 n^2 - 8 n + 1), {n, 0, 40}] (* Vincenzo Librandi, Mar 21 2014 *)
LinearRecurrence[{5, -10, 10, -5, 1}, {1, 3, 133, 931, 3441}, 40] (* Harvey P. Dale, May 04 2016 *)
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PROG
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(Haskell)
a239426 n = (((21 * n - 36) * n + 25) * n - 8) * n + 1
(Magma) [21*n^4-36*n^3+25*n^2-8*n+1: n in [0..31]]; // Vincenzo Librandi, Mar 21 2014
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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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