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 A217530 n^4/2-5*n^3/2+21*n-30. 1
 0, 6, 22, 75, 204, 460, 906, 1617, 2680, 4194, 6270, 9031, 12612, 17160, 22834, 29805, 38256, 48382, 60390, 74499, 90940, 109956, 131802, 156745, 185064, 217050, 253006, 293247, 338100, 387904, 443010, 503781, 570592, 643830, 723894, 811195, 906156, 1009212, 1120810 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 2..1000 W. Griffiths, R. Smith and D. Warren, Almost avoiding pairs of permutations, PU. M. A. Vol. 22 (2011), 129-139. Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1). FORMULA G.f.: x^3*(11*x^3-25*x^2+8*x-6)/(x-1)^5. [Colin Barker, Oct 17 2012] a(n) = 5*a(n-1)-10*a(n-2)+10*a(n-3)-5*a(n-4)+a(n-5). - Wesley Ivan Hurt, Nov 10 2014 MAPLE A217530:=n->n^4/2-5*n^3/2+21*n-30: seq(A217530(n), n=2..50); # Wesley Ivan Hurt, Nov 10 2014 MATHEMATICA Table[n^4/2 - 5 n^3/2 + 21 n - 30, {n, 2, 40}] (* Vincenzo Librandi, Mar 11 2013 *) LinearRecurrence[{5, -10, 10, -5, 1}, {0, 6, 22, 75, 204}, 40] (* Harvey P. Dale, Dec 12 2018 *) PROG (Maxima) makelist(n^4/2-5*n^3/2+21*n-30, n, 2, 40); /* Martin Ettl, Oct 15 2012 */ (MAGMA) [n^4/2-5*n^3/2+21*n-30: n in [2..40]]; // Vincenzo Librandi, Mar 11 2013 CROSSREFS Sequence in context: A276779 A159555 A032195 * A111566 A200052 A051945 Adjacent sequences:  A217527 A217528 A217529 * A217531 A217532 A217533 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Oct 13 2012 STATUS approved

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Last modified October 23 09:24 EDT 2019. Contains 328345 sequences. (Running on oeis4.)