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 A166093 #2 Mar 31 2012 13:21:20 %S A166093 0,1,3,5,7,15,26,13,62,33,11,35,25,55,59,43,130,71,49,29,99,67,74,167, %T A166093 79,85,89,95,146,121,316,47,574,115,65,399,127,31,157,199,83,309,81, %U A166093 193,592,235,137,197,358,277,395,271,191,351,563,119,433,347,229,61 %N A166093 a(n) gives the least i, for which A166085(i) = 2n. %Y A166093 a(n) = (A166090(n)-1)/4. See also A166094, A166095. %K A166093 nonn %O A166093 0,3 %A A166093 _Antti Karttunen_, Oct 08 2009