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 A127784 #5 Mar 13 2014 03:39:21
%S A127784 1,1,3,11,51,266,1540,9681,65291,468401,3551693,28327029,236731183,
%T A127784 2066583601,18796448581,177735656083,1743920667437,17725856560839,
%U A127784 186366309301259,2024042644283702,22679125592930412,261873356070694571
%N A127784 G.f. satisfies: A(x) = 1 + (x+x^2)*A(x+x^2)^2.
%H A127784 Vaclav Kotesovec, <a href="/A127784/b127784.txt">Table of n, a(n) for n = 0..310</a>
%o A127784 (PARI) {a(n)=local(A=1+x+x*O(x^n));for(i=0,n,A=1+subst(x*A^2,x,x+x^2));polcoeff(A,n)}
%Y A127784 Cf. A127782, A127783.
%K A127784 nonn
%O A127784 0,3
%A A127784 _Paul D. Hanna_, Jan 28 2007