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 A104490 #18 Feb 02 2023 10:00:31 %S A104490 1,1,11,1,101,101,11,1,1001,1001,1011,1,101,101,11,1,10001,10001, %T A104490 10011,10001,101,101,11,1,1001,1001,1011,1,101,101,11,1 %N A104490 Read central column in Table 3 in reference from right to left. %C A104490 There is no Table 3 in reference (?). %H A104490 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 A104490 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 A104490 Cf. A102370, A104489. %K A104490 nonn,base,more,uned %O A104490 1,3 %A A104490 _Philippe Deléham_, Apr 20 2005