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 A067507 #7 Dec 05 2013 19:55:09 %S A067507 2,4,8,64,512,2048,8192,16384,32768,131072,2097152,67108864, %T A067507 4294967296,8589934592,68719476736,137438953472,2199023255552, %U A067507 4398046511104,8796093022208,17592186044416,35184372088832,70368744177664 %N A067507 Powers of 2 with even digit sum. %H A067507 <a href="/index/Di#divseq">Index to divisibility sequences</a> %Y A067507 Cf. A067499, A067500, A067501, A067502, A067503, A067504, A067505. %K A067507 base,easy,nonn %O A067507 1,1 %A A067507 _Amarnath Murthy_, Feb 11 2002 %E A067507 Corrected by _Sascha Kurz_, Mar 18 2002