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 A055185 #4 Mar 30 2012 18:57:03 %S A055185 5,1,2,3,4,6,8,10,9,11,13,12,15,7,17,20,16,21,22,23,18,24,25,14,26,28, %T A055185 19,31,32,34,33,36,37,27,40,39,42,29,35,44,45,41,30,47,46,48,51,50,53, %U A055185 54,49,38,57,55,58,61,60,43,64,63,67,69,66 %N A055185 n-th distinct number to appear in A055177; also the n-th to appear in A055194. %C A055185 Conjecture: this sequence is a permutation of the positive integers. %K A055185 nonn %O A055185 1,1 %A A055185 _Clark Kimberling_, Apr 27 2000