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 A038376 a(n) = (n-3)*A006918(n)/2. 1
 0, 0, 0, 0, 1, 5, 12, 28, 50, 90, 140, 220, 315, 455, 616, 840, 1092, 1428, 1800, 2280, 2805, 3465, 4180, 5060, 6006, 7150, 8372, 9828, 11375, 13195, 15120, 17360, 19720, 22440, 25296, 28560, 31977, 35853, 39900, 44460, 49210, 54530, 60060, 66220, 72611 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 REFERENCES K. B. Reid and L. W. Beineke "Tournaments", pp. 169-204 in L. W. Beineke and R. J. Wilson, editors, Selected Topics in Graph Theory, Academic Press, NY, 1978, p. 186 Theorem 6.11. LINKS Colin Barker, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (2,2,-6,0,6,-2,-2,1). FORMULA From Colin Barker, Nov 19 2016: (Start) a(n) = (n^4-3*n^3-4*n^2+12*n)/48 for n even. a(n) = (n^4-3*n^3-n^2+3*n)/48 for n odd. a(n) = 2*a(n-1) + 2*a(n-2) - 6*a(n-3) + 6*a(n-5) - 2*a(n-6) - 2*a(n-7) + a(n-8) for n>7. G.f.: x^4*(1+3*x) / ((1-x)^5 * (1+x)^3) (End) PROG (PARI) concat(vector(4), Vec(x^4*(1+3*x) / ((1-x)^5 * (1+x)^3) + O(x^100))) \\ Colin Barker, Nov 19 2016 CROSSREFS Sequence in context: A145768 A162778 A160807 * A002767 A055245 A196410 Adjacent sequences:  A038373 A038374 A038375 * A038377 A038378 A038379 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified December 5 05:13 EST 2021. Contains 349530 sequences. (Running on oeis4.)