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 A192339 #7 Nov 13 2012 08:22:41 %S A192339 0,1,3,11,37,125,415,1371,4501,14725,48031,156355,508197,1649933, %T A192339 5352255,17351563,56226389,182134837 %N A192339 Coefficient of x in the reduction of n-th polynomial at A157751 by x^2->x+2. %C A192339 For an introduction to reductions of polynomials by substitutions such as x^2->x+2, see A192232. %F A192339 Empirical G.f.: -x^2*(x+1)*(2*x-1)/((x^2+2*x-1)*(4*x^2+2*x-1)). [_Colin Barker_, Nov 13 2012] %t A192339 (See A192338.) %Y A192339 Cf. , A192232, A192313, A192338. %K A192339 nonn %O A192339 1,3 %A A192339 _Clark Kimberling_, Jun 28 2011