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 A195081 #6 Mar 30 2012 18:57:44 %S A195081 1,3,2,6,5,4,9,10,8,7,13,15,14,12,11,18,21,20,19,17,16,24,28,27,26,25, %T A195081 23,22,31,35,36,34,33,32,30,29,39,43,45,44,42,41,40,38,37,48,52,55,54, %U A195081 53,51,50,49,47,46,58,62,66,65,64,63,61,60,59,57,56,69,73,77 %N A195081 Inverse permutation of A195080; every positive integer occurs exactly once. %t A195081 (See A195080.) %Y A195081 Cf. A195080, A195079, A194959. %K A195081 nonn %O A195081 1,2 %A A195081 _Clark Kimberling_, Sep 08 2011