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 A158270 #5 Mar 30 2012 18:52:03 %S A158270 0,9,5,3,1,3,3,5,7,9 %N A158270 Single-digit numbers in A061049. %Y A158270 Cf. A158273. %K A158270 nonn,base,fini,full,less %O A158270 1,2 %A A158270 _Paul Curtz_, Mar 15 2009 %E A158270 Edited and extended by _R. J. Mathar_, Apr 04 2009 %E A158270 Keywords by _Charles R Greathouse IV_, Aug 02 2010