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 A195109 #6 Mar 30 2012 18:57:44 %S A195109 1,2,3,6,4,5,9,7,10,8,13,15,11,14,12,21,18,20,16,19,17,27,24,26,28,22, %T A195109 25,23,34,31,36,33,35,29,32,30,42,45,39,44,41,43,37,40,38,55,51,54,48, %U A195109 53,50,52,46,49,47,65,61,64,58,66,63,60,62,56,59,57,76,72,75 %N A195109 Inverse permutation of A195108; every positive integer occurs exactly once. %t A195109 (See A195108.) %Y A195109 Cf. A195108, A195107, A004736, A194959, A195110. %K A195109 nonn %O A195109 1,2 %A A195109 _Clark Kimberling_, Sep 09 2011