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 A212204 #7 Jun 12 2012 11:29:53 %S A212204 1,2,4,8,16,18,65,72,256,258,260,266,4101,4132,4167,4290,65536,65540, %T A212204 65542,65544,65594,65600,65658,65694 %N A212204 Positions in A212200 where successive new numbers (see A212203) appear. %D A212204 J. H. Conway and Alex Ryba, Personal communication, May 03 2012 and Jun 10 2012 %e A212204 A212200 begins 1, 3, 3, 15, 15, 15, 15, 5, 15, 5, 15, 15, 5, 5, 15, 85, ..., containing 1, 3, 15, 5, 85, ..., which gives the beginning of A212203. The numbers in question appear at positions 1, 2, 4, 8, 16, 18, ..., which is A212204. %K A212204 nonn %O A212204 1,2 %A A212204 _N. J. A. Sloane_, May 03 2012 %E A212204 More terms from Alex Ryba, Jun 10 2012