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 A301409 #4 Mar 21 2018 08:01:02 %S A301409 1,1,3,11,47,221,1115,5947,33231,193453,1169239,7322827,47479855, %T A301409 318661109,2214609419,15948123771,119101155215,923085573061, %U A301409 7428862280327,62094175343547,538956428549743,4854974080968669,45347892277523467,438688081755797051,4389356528040108847 %N A301409 G.f. A(x) satisfies: A(x) = 1/(1 - x*A(x) - x^2*A(x)/(1 - 2*x*A(x) - 2*x^2*A(x)/(1 - 3*x*A(x) - 3*x^2*A(x)/(1 - ...)))), a continued fraction. %e A301409 G.f. A(x) = 1 + x + 3*x^2 + 11*x^3 + 47*x^4 + 221*x^5 + 1115*x^6 + 5947*x^7 + 33231*x^8 + ... %Y A301409 Cf. A000110, A088368. %K A301409 nonn %O A301409 0,3 %A A301409 _Ilya Gutkovskiy_, Mar 20 2018