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 A190851 #9 May 31 2022 14:55:27 %S A190851 1,2,4,7,8,11,13,14,16,20,22,25,26,28,32,38,40,43,44,49,50,52,56,64, %T A190851 65,67,74,76,79,80,85,86,88,97,98,100,101,104,112,119,121,128,130,133, %U A190851 134,146,148,151,152,157,158,160,169,170,172,176,182,193,194,196,200,202,208,224,227,229,236,238,241,242,254,256,259,260,265,266 %N A190851 Integers in (A190808)/2; contains A190808 as a proper subsequence. %C A190851 See A190803. %t A190851 (* See A190808. *) %Y A190851 Cf. A190803, A190808, A190852. %K A190851 nonn %O A190851 1,2 %A A190851 _Clark Kimberling_, May 25 2011