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 A055179 #4 Mar 30 2012 18:57:03 %S A055179 3,1,2,6,5,7,4,8,9,10,12,11,15,18,13,16,21,17,24,27,19,30,20,32,22,34, %T A055179 23,37,26,14,25,41,35,28,29,44,40,31,50,42,33,54,48,38,58,52,45,62,55, %U A055179 65,59,49,51,68,63,36,43,53,72,66,39,78,71 %N A055179 n-th distinct number to appear in A055171; also the n-th to appear in A055191. %C A055179 Conjecture: this sequence is a permutation of the positive integers. %K A055179 nonn %O A055179 1,1 %A A055179 _Clark Kimberling_, Apr 27 2000