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 A113314 #2 Mar 30 2012 17:27:47 %S A113314 1,4,11,680,2,28,9,65,7,26,3,146,5,63,24,317,22,61,20,144,3038,18,6, %T A113314 59,16,8,142,10,14,57,12,315,55,140,53,6353,313,51,138,49,678,136,47, %U A113314 1441,45,134,43,311,676,41,132,13,39,309,15,37,17,130,19,35,3036,21,33,23 %N A113314 a(n) is the index k such that A111118(k) = n. %e A113314 A111118(680) = 4, hence a(4) = 680. %Y A113314 Cf. A111118, A111187. %K A113314 nonn %O A113314 1,2 %A A113314 _Klaus Brockhaus_, Oct 25 2005