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 A027164 #8 Nov 21 2013 12:46:24
%S A027164 1,3,10,22,67,145,436,940,2821,6079,18238,39298,117895,254029,762088,
%T A027164 1642072,4926217,10614523,31843570,68613358,205840075,443523721,
%U A027164 1330571164,2866982404,8600947213,18532465591,55597396774
%N A027164 a(n) = T(n,0) + T(n,1) + ... + T(n,n), T given by A027157.
%F A027164 G.f.: x(x^2+2x+1)/[(1-x)(1-6x^2-3x^4)].
%t A027164 CoefficientList[Series[(1+2x+x^2)/(1-x-6x^2+6x^3-3x^4 + 3x^5),{x,0,30}],x] (* _Harvey P. Dale_, Mar 20 2011 *)
%K A027164 nonn
%O A027164 0,2
%A A027164 _Clark Kimberling_