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 A190853 #5 Mar 30 2012 18:57:29 %S A190853 1,2,4,5,7,8,10,13,14,16,17,20,22,25,26,28,31,32,34,40,43,44,49,50,52, %T A190853 53,56,61,62,64,67,68,76,79,80,85,86,88,94,97,98,100,103,104,106,112, %U A190853 121,122,124,128,130,133,134,136,148,151,152,157,158,160,161,169,170,172,176,184,187,188,193,194,196,200,202,205,206,208,212 %N A190853 Integers in (A190809)/2; contains A190809 as a proper subsequence. %C A190853 See A190803. %t A190853 (See A190809.) %Y A190853 Cf. A190803, A190809, A190854. %K A190853 nonn %O A190853 1,2 %A A190853 _Clark Kimberling_, May 25 2011