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 A192781 Coefficient of x in the reduction of the n-th Fibonacci polynomial by x^3->x^2+1. 3
 0, 1, 0, 2, 1, 4, 6, 12, 25, 46, 96, 183, 368, 720, 1424, 2809, 5536, 10930, 21545, 42516, 83846, 165404, 326257, 643550, 1269440, 2503983, 4939232, 9742752, 19217952, 37908017, 74774848, 147495906, 290940561, 573890084, 1132017286, 2232942124 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS For discussions of polynomial reduction, see A192232 and A192744. LINKS Index entries for linear recurrences with constant coefficients, signature (1,3,-1,-3,1,1). FORMULA a(n)=a(n-1)+3*a(n-2)-a(n-3)-3*a(n-4)+a(n-5)+a(n-6). G.f.: x^2*(x^2+x-1)/(x^6+x^5-3*x^4-x^3+3*x^2+x-1). [Colin Barker, Nov 23 2012] EXAMPLE The first five polynomials p(n,x) and their reductions: F1(x)=1 -> 1 F2(x)=x -> x F3(x)=x^2+1 -> x^2+1 F4(x)=x^3+2x -> x^2+2x+1 F5(x)=x^4+3x^2+1 -> 4x^2+1x+2, so that A192777=(1,0,1,1,2,...), A192778=(0,1,0,2,1,...), A192779=(0,0,1,1,4,...) MATHEMATICA q = x^3; s = x^2 + 1; z = 40; p[n_, x_] := Fibonacci[n, x]; Table[Expand[p[n, x]], {n, 1, 7}] reduce[{p1_, q_, s_, x_}] := FixedPoint[(s PolynomialQuotient @@ #1 +        PolynomialRemainder @@ #1 &)[{#1, q, x}] &, p1] t = Table[reduce[{p[n, x], q, s, x}], {n, 1, z}]; u1 = Table[Coefficient[Part[t, n], x, 0], {n, 1, z}]   (* A192780 *) u2 = Table[Coefficient[Part[t, n], x, 1], {n, 1, z}]   (* A192781 *) u3 = Table[Coefficient[Part[t, n], x, 2], {n, 1, z}]   (* A192782 *) CROSSREFS Cf. A192744, A192232, A192616, A192780, A192782. Sequence in context: A205845 A034424 A095012 * A253918 A269415 A019142 Adjacent sequences:  A192778 A192779 A192780 * A192782 A192783 A192784 KEYWORD nonn,easy AUTHOR Clark Kimberling, Jul 09 2011 STATUS approved

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Last modified November 26 11:03 EST 2022. Contains 358357 sequences. (Running on oeis4.)