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 A195075 #5 Mar 30 2012 18:57:44 %S A195075 1,3,2,5,6,4,8,10,9,7,12,14,15,13,11,17,19,21,20,18,16,23,25,28,27,26, %T A195075 24,22,30,32,35,36,34,33,31,29,38,40,43,45,44,42,41,39,37,47,49,52,54, %U A195075 55,53,51,50,48,46,57,59,62,64,66,65,63,61,60,58,56,68,70,73 %N A195075 Inverse permutation of A195074; every positive integer occurs exactly once. %C A195075 Not identical to A194989; see Comments at A195074. %t A195075 (See A195074.) %Y A195075 Cf. A195074, A195073. %K A195075 nonn %O A195075 1,2 %A A195075 _Clark Kimberling_, Sep 08 2011