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 A145159 #2 Mar 30 2012 18:37:15
%S A145159 1,2,7,38,283,2624,28408,344972,4580833,65410070,992850781,
%T A145159 15888876224,266464473274,4661494891166,84761554257517,
%U A145159 1597453996121132,31132664696108551,626239933178389916,12981131500452667888
%N A145159 G.f. A(x) satisfies A(x/A(x)) = 1/(1-x)^2.
%F A145159 Self-convolution of A145158.
%o A145159 (PARI) {a(n)=local(A=1+x+x*O(x^n));for(n=0,n,B=serreverse(x/A);A=1/(1-B)^2);polcoeff(A,n)}
%Y A145159 Cf. A145158.
%K A145159 nonn
%O A145159 0,2
%A A145159 _Paul D. Hanna_, Oct 03 2008