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 A208754 #6 Mar 30 2012 18:58:14 %S A208754 1,3,5,2,7,10,9,28,4,11,60,28,13,110,108,8,15,182,308,72,17,280,728, %T A208754 352,16,19,408,1512,1248,176,21,570,2856,3600,1040,32,23,770,5016, %U A208754 8976,4400,416,25,1012,8316,20064,14960,2880,64,27,1300,13156,41184 %N A208754 Triangle of coefficients of polynomials v(n,x) jointly generated with A208753; see the Formula section. %C A208754 For a discussion and guide to related arrays, see A208510. %F A208754 u(n,x)=u(n-1,x)+2x*v(n-1,x), %F A208754 v(n,x)=u(n-1,x)+v(n-1,x)+1, %F A208754 where u(1,x)=1, v(1,x)=1. %e A208754 First five rows: %e A208754 1 %e A208754 3 %e A208754 5...2 %e A208754 7...10 %e A208754 9...28...4 %e A208754 First five polynomials v(n,x): %e A208754 1 %e A208754 3 %e A208754 5 + 2x %e A208754 7 + 10x %e A208754 9 + 28x + 4x^2 %t A208754 u[1, x_] := 1; v[1, x_] := 1; z = 16; %t A208754 u[n_, x_] := u[n - 1, x] + 2 x*v[n - 1, x]; %t A208754 v[n_, x_] := u[n - 1, x] + v[n - 1, x] + 1; %t A208754 Table[Expand[u[n, x]], {n, 1, z/2}] %t A208754 Table[Expand[v[n, x]], {n, 1, z/2}] %t A208754 cu = Table[CoefficientList[u[n, x], x], {n, 1, z}]; %t A208754 TableForm[cu] %t A208754 Flatten[%] (* A208753 *) %t A208754 Table[Expand[v[n, x]], {n, 1, z}] %t A208754 cv = Table[CoefficientList[v[n, x], x], {n, 1, z}]; %t A208754 TableForm[cv] %t A208754 Flatten[%] (* A208754 *) %Y A208754 Cf. A208753, A208510. %K A208754 nonn,tabf %O A208754 1,2 %A A208754 _Clark Kimberling_, Mar 03 2012