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 A290924 a(n) = (1/2)*A290923(n). 3
 1, 5, 23, 104, 469, 2115, 9539, 43024, 194053, 875245, 3947651, 17805240, 80307649, 362214635, 1633710407, 7368586016, 33234813001, 149900237685, 676100727791, 3049442757256, 13754017334317, 62035266076915, 279800013602699, 1261992614249520, 5692013155802701 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Clark Kimberling, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (6, -8, 6, -1) FORMULA G.f.: (1 - x + x^2)/(1 - 6 x + 8 x^2 - 6 x^3 + x^4). a(n) = 6*a(n-1) - 8*a(n-2) + 6*a(n-3) - a(n-4). MATHEMATICA z = 60; s = x/(1 - x)^2; p = 1 - 2 s - 2 s^2; Drop[CoefficientList[Series[s, {x, 0, z}], x], 1] (* A000027 *) u = Drop[CoefficientList[Series[1/p, {x, 0, z}], x], 1]  (* A290923 *) u/2   (* A290924 *) CROSSREFS Cf. A000027, A290890. Sequence in context: A218985 A129162 A167660 * A026760 A064914 A243873 Adjacent sequences:  A290921 A290922 A290923 * A290925 A290926 A290927 KEYWORD nonn,easy AUTHOR Clark Kimberling, Aug 19 2017 STATUS approved

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Last modified May 14 13:20 EDT 2021. Contains 343884 sequences. (Running on oeis4.)