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 A131863 #2 Mar 30 2012 18:50:58 %S A131863 4,6,12,14,36,38,44,46,64,66,68,69,70,71,72,74,76,77,78,79,84,86,92, %T A131863 94,96,98,100,101,102,103,104,106,108,109,110,111,116,118,124,126,132, %U A131863 134,140,142,164,166,172,174,192,194,196,197,198,199,200,202,204,205,206 %N A131863 Numbers m such that A131851(m) < 0. %Y A131863 Cf. A131864, A131854, A131859, A131861. %K A131863 nonn %O A131863 1,1 %A A131863 _Reinhard Zumkeller_, Jul 22 2007