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 A057124 #2 May 01 2014 02:48:24 %S A057124 0,0,3,7,26,34,59,75,100,242,255,318,344,388,587,595,738,772,816,1007, %T A057124 1023,1110,1261,2556,2575,2701,2739,2809,3399,3412,3688,3739,3809, %U A057124 4212,4238,4377,4632,6534,6547,6610,6636,6680,8177,8185,8541,8600,8670,9065 %N A057124 Local ranks of terms of A057122. %p A057124 a(n) = CatalanRank(floor(binwidth(bintree_depth_first2tree(A014486[n]))/2),bintree_depth_first2tree(A014486[n])) %K A057124 nonn %O A057124 0,3 %A A057124 _Antti Karttunen_, Aug 11 2000