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 A194910 #5 Mar 30 2012 18:57:44 %S A194910 1,3,2,6,5,4,10,9,8,7,15,14,13,12,11,21,20,19,18,17,16,28,27,26,25,24, %T A194910 23,22,35,34,33,32,31,30,29,36,43,42,41,40,39,38,45,37,44,52,51,50,49, %U A194910 48,55,47,54,46,53,62,61,60,59,66,58,65,57,64,56,63,73,72,71 %N A194910 Inverse permutation of A194909; every positive integer occurs exactly once. %t A194910 (See A194908.) %Y A194910 Cf. A194908, A194909. %K A194910 nonn %O A194910 1,2 %A A194910 _Clark Kimberling_, Sep 05 2011