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 A105771 #2 Mar 31 2012 13:46:51 %S A105771 1,2,4,5,7,9,12,22,24,31,33,35,36,42,44,46,48,52,61,72,81,92,222,311, %T A105771 411,522,611,722,822,911,2222,2231,3122,3131,4222,5111,6222,6231,7122, %U A105771 8222,8231,9112 %N A105771 Slowest increasing sequence which self-describes its succession of odd and even digits. %e A105771 1 2 4 5 7 9 12 22 24 31 33 35 36 42 44 46 48 52 61 72 81 92 222 311 %e A105771 . ^ ^ . . . .^ ^^ ^^ .. .. .. .^ ^^ ^^ ^^ ^^ .^ ^. .^ ^. .^ ^^^ ... %e A105771 1 2 4 5 7 9 1 2 2 2 2 4 3 %K A105771 base,easy,nonn %O A105771 1,2 %A A105771 _Eric Angelini_, May 04 2005