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 A151746 #5 Jan 13 2015 18:12:42
%S A151746 1,4,10,32,118,460,1826,7288,29134,116516,466042,1864144,7456550,
%T A151746 29826172,119304658,477218600,1908874366,7635497428,30541989674,
%U A151746 122167958656,488671834582,1954687338284,7818749353090,31274997412312,125099989649198,500399958596740
%N A151746 G.f.: (1-2*x-5*x^2+4*x^3)/((1-4*x)*(1-x)^2).
%F A151746 a(n) = 14/9+2*n/3+4^(n+1)/9, n>0. [From _R. J. Mathar_, Jun 17 2009]
%t A151746 CoefficientList[Series[(1-2x-5x^2+4x^3)/((1-4x)(1-x)^2),{x,0,30}],x] (* _Harvey P. Dale_, Jan 13 2015 *)
%Y A151746 Subsequence of A151735 at powers of 2.
%K A151746 nonn
%O A151746 0,2
%A A151746 _N. J. A. Sloane_, Jun 16 2009