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 A209169 Triangle of coefficients of polynomials v(n,x) jointly generated with A209168; see the Formula section. 3
 1, 2, 3, 3, 7, 7, 5, 16, 23, 17, 8, 33, 65, 70, 41, 13, 65, 159, 233, 204, 99, 21, 124, 362, 654, 776, 577, 239, 34, 231, 782, 1676, 2447, 2461, 1597, 577, 55, 423, 1627, 4018, 6937, 8586, 7534, 4348, 1393, 89, 764, 3289, 9179, 18202, 26597, 28750 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 1: Fibonacci numbers (A000045). For a discussion and guide to related arrays, see A208510. LINKS Table of n, a(n) for n=1..52. FORMULA u(n,x)=u(n-1,x)+(x+1)*v(n-1,x), v(n,x)=(x+1)*u(n-1,x)+2x*v(n-1,x)+1, where u(1,x)=1, v(1,x)=1. T(n,k) = T(n-1,k) + 2*T(n-1,k-1) + T(n-2,k) + T(n-2,k-2), T(1,0) = 1, T(2,0) = 2, T(2,1) = 3, T(n,k) = 0 if k<0 or if k>=n. - Philippe Deléham, 11 2012 EXAMPLE First five rows: 1 2...3 3...7....7 5...16...23...17 8...33...65...70...41 MATHEMATICA First three polynomials v(n, x): 1, 2 + 3x, 3 + 7x + 7x^2. u[1, x_] := 1; v[1, x_] := 1; z = 16; u[n_, x_] := u[n - 1, x] + (x + 1)*v[n - 1, x]; v[n_, x_] := (x + 1)*u[n - 1, x] + 2 x*v[n - 1, x] + 1; Table[Expand[u[n, x]], {n, 1, z/2}] Table[Expand[v[n, x]], {n, 1, z/2}] cu = Table[CoefficientList[u[n, x], x], {n, 1, z}]; TableForm[cu] Flatten[%] (* A209168 *) Table[Expand[v[n, x]], {n, 1, z}] cv = Table[CoefficientList[v[n, x], x], {n, 1, z}]; TableForm[cv] Flatten[%] (* A209169 *) CROSSREFS Cf. A209168, A208510. Sequence in context: A208920 A210234 A209768 * A222294 A181850 A335050 Adjacent sequences: A209166 A209167 A209168 * A209170 A209171 A209172 KEYWORD nonn,tabl AUTHOR Clark Kimberling, Mar 08 2012 STATUS approved

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)