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 A057120 #3 May 01 2014 02:48:24
%S A057120 1,2,12,970,21801077,33006325301864331,
%T A057120 216010416087275256441802643730702446
%N A057120 Global ranks of terms of A057119.
%C A057120 CatalanRankGlobal given in A057117.
%F A057120 map(CatalanRankGlobal, A057119) or a(n) = A057121(n) + Sum_{j=0..((2^n)-1)} A000108[j]
%K A057120 nonn
%O A057120 0,2
%A A057120 _Antti Karttunen_, Aug 11 2000