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 A123955 G.f.: x^5/( (1-3*x) * (1-2*x) * (1-4*x) * (6*x^2-6*x+1) ). 0
 0, 0, 0, 0, 1, 15, 139, 1029, 6691, 40041, 226435, 1230009, 6487195, 33464145, 169720915, 849504825, 4208146411, 20674387905, 100901918659, 489826044489, 2367517203931, 11402423910801, 54755709794995, 262308279256089 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS FORMULA a(n)= 15*a(n-1) -86*a(n-2) +234*a(n-3) -300*a(n-4) +144*a(n-5). a(n)= -2^n/8 +3^n/9 -4^n/16 +A094433(n+1)/12. [Mar 28 2010] MATHEMATICA M = {{3, -1, 0, 0, 0}, {-1, 3, -1, 0, 0}, {0, -1, 3, -1, 0}, {0, 0, -1, 3, -1}, {0, 0, 0, -1, 3}}; v[1] = {0, 0, 0, 0, 1}; v[n_] := v[n] = M.v[n - 1]; a1 = Table[v[n][[1]], {n, 1, 50}] CROSSREFS Sequence in context: A030056 A225978 A175707 * A027802 A302855 A133716 Adjacent sequences:  A123952 A123953 A123954 * A123956 A123957 A123958 KEYWORD nonn,easy AUTHOR Gary W. Adamson and Roger L. Bagula, Oct 27 2006 EXTENSIONS G.f. proposed by Maksym Voznyy checked and corrected by R. J. Mathar, Sep 16 2009 Definition replaced with Voznyy's generating function of Jul 2009 - the Assoc. Eds of the OEIS, Mar 28 2010 STATUS approved

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Last modified February 17 02:33 EST 2019. Contains 320200 sequences. (Running on oeis4.)