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 A132833 #2 Mar 30 2012 18:37:04
%S A132833 1,2,5,14,42,126,377,1130,3390,10170,30509,91526,274577,823730,
%T A132833 2471190,7413570,22240710,66722130,200166390,600499170,1801497510,
%U A132833 5404492530,16213477590,48640432770,145921298310,437763894930,1313291684789
%N A132833 Largest terms a(n) forming a self-convolution of an integer sequence (A132834) such that: a(n) <= 3*a(n-1) for n>0 with a(0)=1.
%o A132833 (PARI) {a(n)=local(B=[1]);if(n==0,1,for(k=1,n,t=3*a(k-1);B=concat(B,t); B[ #B]=t+1-denominator(Vec(Ser(B)^(1/2))[ #B]) ));B[n+1]}
%Y A132833 Cf. A132834 (square-root); A132831 (variant).
%K A132833 nonn
%O A132833 0,2
%A A132833 _Paul D. Hanna_, Sep 07 2007