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 A231891 #20 Apr 13 2021 23:43:25 %S A231891 1,100,11,1000,10,101,1011,110,1101,10001,1110,10010,1111,10000,111, %T A231891 1001,1010,1100,10011,10100,10101,10110,11000,10111,100000,11011, %U A231891 100001,11001,11010,11100,100010,11101,100011 %N A231891 Base-2 analog of A231881 (written in base 2). %C A231891 A231889 (and A231890) eventually merges with A231891 (and A231892). For n > 29, a(n) = A231889(n+1). - _Hans Havermann_, Nov 18 2013 %H A231891 Hans Havermann, <a href="/A231891/b231891.txt">Table of n, a(n) for n = 0..1000</a> %Y A231891 Cf. A228407, A231880, A231881, A231889-A231892. %K A231891 nonn,base %O A231891 0,2 %A A231891 _N. J. A. Sloane_, Nov 17 2013 %E A231891 More terms from _Hans Havermann_, Nov 18 2013