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 A107384 a(n)= a(n-1) +3*a(n-2) -3*a(n-4). 0
 0, 1, 1, 2, 5, 8, 20, 38, 83, 173, 362, 767, 1604, 3386, 7112, 14969, 31493, 66242, 139385, 293204, 616880, 1297766, 2730251, 5743937, 12084050, 25422563, 53483960, 112519838, 236719568, 498011393, 1047718217, 2204192882 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS FORMULA Limit a(n)/a(n-1)=2.1038034027.. G.f.: x*(-1+2*x^2)/((1-x) * (3*x^3+3*x^2-1)). [Sep 28 2009] MATHEMATICA m = 3 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 aa = Table[a[n], {n, 0, digits}] CROSSREFS Sequence in context: A054774 A104721 A139407 * A205596 A092446 A087077 Adjacent sequences:  A107381 A107382 A107383 * A107385 A107386 A107387 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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