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 A194078 #5 Mar 30 2012 18:57:39 %S A194078 1,3,2,5,4,8,6,7,12,9,11,17,13,16,23,18,10,22,30,24,14,29,38,31,19,37, %T A194078 47,39,25,46,57,48,32,15,56,68,58,40,20,67,69,49,26,59,33,70,41,50,21, %U A194078 60,27,71,34,42,51,61 %N A194078 Inverse permutation of A194077; every positive integer occurs exactly once. %t A194078 (See A194077.) %Y A194078 Cf. A194077. %K A194078 nonn %O A194078 1,2 %A A194078 _Clark Kimberling_, Aug 14 2011