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 A107383 a(n) = 2*a(n-2)+2*a(n-3). 0
 0, 1, 1, 2, 4, 6, 12, 20, 36, 64, 112, 200, 352, 624, 1104, 1952, 3456, 6112, 10816, 19136, 33856, 59904, 105984, 187520, 331776, 587008, 1038592, 1837568, 3251200, 5752320, 10177536, 18007040, 31859712, 56369152, 99733504, 176457728 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Index to sequences with linear recurrences with constant coefficients, signature (0,2,2). FORMULA G.f.: x*(1+x)/(1-2*x^2-2*x^3). [Sep 28 2009] a(n) = (-1)^(n+1)*A078025(n-1) [Sep 28 2009] Limit a(n)/a(n-1) = 1.7692923.. a(n)+a(n+1) = A061279(n). - R. J. Mathar, Dec 01 2011 MATHEMATICA m = 2 a[0] = 0; a[1] = 1; a[2] = 1; a[3] = 2; a[n_] := a[n] = a[n - 1] + m*a[n - 2] - m*a[n - 4] digits = 50 CROSSREFS Sequence in context: A068018 A060798 A134320 * A078025 A178901 A164146 Adjacent sequences:  A107380 A107381 A107382 * A107384 A107385 A107386 KEYWORD nonn,easy AUTHOR Roger L. Bagula, May 24 2005 EXTENSIONS Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009 STATUS approved

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