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 A115966 #2 Mar 30 2012 17:27:48 %S A115966 1,3,2,5,7,4,9,11,13,6,15,17,8,19,21,23,10,25,27,12,29,31,14,33,35,37, %T A115966 16,39,41,18,43,45,47,20,49,51,22,53,55,24,57,59,61,26,63,65,28,67,69, %U A115966 71,30,73,75,32,77,79,81,34,83,85,36,87,89,38,91,93,95,40,97,99,42,101 %N A115966 Inverse permutation to sequence A094077. %e A115966 A094077(7) = 5, so a(5) = 7. %Y A115966 Cf. A094077. %K A115966 nonn %O A115966 1,2 %A A115966 _Klaus Brockhaus_, Feb 13 2006