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 A104401 #12 May 07 2020 02:29:55 %S A104401 0,1,2,4,5,6,8,9,10,12,13,14,16,17,18,20,21,22,24,25,26,28,29,30,32, %T A104401 33,34,36,37,38,40,41,42,44,45,46,48,49,50,52,53,54,56,57,58,60,61,64, %U A104401 65,66,68,69,70,72,73,74,76,77,78 %N A104401 a(n) = A104235(n)/4. %C A104401 First differs from A004773(n)=floor(4n/3) at a(47)=64 vs A004773(47)=62. - _M. F. Hasler_, Oct 05 2014 %H A104401 David Applegate, Benoit Cloitre, Philippe Deléham and N. J. A. Sloane, Sloping binary numbers: a new sequence related to the binary numbers [<a href="http://neilsloane.com/doc/slopey.pdf">pdf</a>, <a href="http://neilsloane.com/doc/slopey.ps">ps</a>]. %H A104401 David Applegate, Benoit Cloitre, Philippe Deléham and N. J. A. Sloane, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL8/Sloane/sloane300.html">Sloping binary numbers: a new sequence related to the binary numbers</a>, J. Integer Seq. 8 (2005), no. 3, Article 05.3.6, 15 pp. %Y A104401 Cf. A004773, A104235 %K A104401 nonn %O A104401 0,3 %A A104401 _N. J. A. Sloane_, Apr 18 2005