This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A209564 #6 Mar 30 2012 18:58:15 %S A209564 1,1,2,1,2,3,1,2,5,4,1,2,5,11,5,1,2,5,13,21,6,1,2,5,13,32,36,7,1,2,5, %T A209564 13,34,72,57,8,1,2,5,13,34,87,148,85,9,1,2,5,13,34,89,212,281,121,10, %U A209564 1,2,5,13,34,89,231,485,499,166,11,1,2,5,13,34,89,233,585,1039 %N A209564 Triangle of coefficients of polynomials v(n,x) jointly generated with A209559; see the Formula section. %C A209564 A209563: first k terms of row n are F(2), ..., F(2k), where F = A000045 (Fibonacci numbers) and k=floor ((n+1)/2). %C A209564 A209564: first k terms of row n are F(1), ..., F(2k-1), where k=floor ((n+2)/2). %C A209564 For a discussion and guide to related arrays, see A208510. %F A209564 u(n,x)=x*u(n-1,x)+v(n-1,x), %F A209564 v(n,x)=x*u(n-1,x)+x*v(n-1,x)+1, %F A209564 where u(1,x)=1, v(1,x)=1. %e A209564 First five rows: %e A209564 1 %e A209564 1...2 %e A209564 1...2...3 %e A209564 1...2...5...4 %e A209564 1...2...5...11...1 %e A209564 First three polynomials v(n,x): 1, 1+2x , 1+2x+3x^2 . %t A209564 u[1, x_] := 1; v[1, x_] := 1; z = 16; %t A209564 u[n_, x_] := x*u[n - 1, x] + v[n - 1, x]; %t A209564 v[n_, x_] := x*u[n - 1, x] + x*v[n - 1, x] + 1; %t A209564 Table[Expand[u[n, x]], {n, 1, z/2}] %t A209564 Table[Expand[v[n, x]], {n, 1, z/2}] %t A209564 cu = Table[CoefficientList[u[n, x], x], {n, 1, z}]; %t A209564 TableForm[cu] %t A209564 Flatten[%] (* A209563 *) %t A209564 Table[Expand[v[n, x]], {n, 1, z}] %t A209564 cv = Table[CoefficientList[v[n, x], x], {n, 1, z}]; %t A209564 TableForm[cv] %t A209564 Flatten[%] (* A209564 *) %Y A209564 Cf. A209563, A208510. %K A209564 nonn,tabl %O A209564 1,3 %A A209564 _Clark Kimberling_, Mar 10 2012