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 A135135 #5 Mar 30 2012 18:40:03 %S A135135 1,3,4,8,9,12,15,17,20,21,23,26,30,33,35,38,40,44,45,46,49,53,55,58, %T A135135 61,63,66,68,70,73,77,81,84,86,88,90,92,94,96,97,100,102,106,108,110, %U A135135 112,116,118,121,123,126,129,131,134,136,140,142,144,146,150,154,156,158 %N A135135 Numbers n such that A111426(n) is even. %Y A135135 Cf. A054741, A005100, A111426. %K A135135 nonn %O A135135 1,2 %A A135135 _Giovanni Teofilatto_, Feb 12 2008 %E A135135 Most of the existing 16 entries replaced and sequence extended by _R. J. Mathar_, Jun 28 2010