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 A166094 #2 Mar 31 2012 13:21:20 %S A166094 0,2,4,103,22,10,12,16,6,52,122,115,56,40,18,112,86,205,30,50,70,100, %T A166094 76,162,93,80,66,108,102,146,166,274,312,170,128,208,655,206,295,198, %U A166094 120,156,264,176,96,246,408,190,85,476,306,260,180,414,342,508,380 %N A166094 Leftmost column of A166091. %C A166094 a(n) gives the least i, for which A166086(i) = 2n+1. %Y A166094 See also A166093, A166096. %K A166094 nonn %O A166094 0,2 %A A166094 _Antti Karttunen_, Oct 08 2009