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 A057518 #5 Aug 03 2017 00:40:52 %S A057518 2,5,6,12,13,15,16,19,31,32,34,35,36,40,41,43,44,47,52,53,56,60,87,88, %T A057518 90,91,92,96,97,99,100,101,103,104,105,106,115,116,118,119,120,124, %U A057518 125,127,128,131,136,137,140,144,152,153,155,156,159,164,165,168,172,178 %N A057518 The global ranks of each term of A057517, i.e., tells that A057515(A057518(n)) = 2 for all n. %p A057518 map(CatalanRankGlobal, A057517); # CatalanRankGlobal given in A057117. %Y A057518 Cf. A057517, A057519. %K A057518 nonn %O A057518 1,1 %A A057518 _Antti Karttunen_, Sep 03 2000