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 A194916 #5 Mar 30 2012 18:57:44 %S A194916 1,3,2,5,6,4,8,10,9,7,12,15,14,13,11,17,20,21,19,18,16,23,26,28,27,25, %T A194916 24,22,30,33,36,35,34,32,31,29,38,41,44,45,43,42,40,39,37,47,50,53,55, %U A194916 54,52,51,49,48,46,57,60,63,66,65,64,62,61,59,58,56,68,71,74 %N A194916 Inverse permutation of A194915; every positive integer occurs exactly once. %t A194916 (See A194915.) %Y A194916 Cf. A194915, A194914, A194959. %K A194916 nonn %O A194916 1,2 %A A194916 _Clark Kimberling_, Sep 08 2011