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 A101333 #12 Jan 21 2019 19:01:55 %S A101333 0,0,0,0,0,0,0,1,2,4,8,16,32,65,130,260,520,1040,2080,4161,8322,16644, %T A101333 33288,66577,133154,266309,532618,1065236,2130472,4260944 %N A101333 A081254-A072762. %C A101333 Very close to 2^n %K A101333 nonn %O A101333 0,9 %A A101333 _Jorge Coveiro_, Dec 24 2004 %E A101333 Comments moved to new sequence A195904 by _Jeremy Gardiner_, Sep 25 2011