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 A108787 #12 Jun 11 2019 19:54:42 %S A108787 1,10,11,11,100,101,110,111,1000,1000,1000,1001,1001,1010,1011,1100, %T A108787 1100,1101,1110,1111,10000,10000,10000,10000,10001,10001,10001,10001, %U A108787 10010,10010,10010,10010,10011,10011,10011,10100,10101,10101 %N A108787 Binary numbers such that the first differences give the same sequence written as a string of individual digits. %H A108787 Robert Israel, <a href="/A108787/b108787.txt">Table of n, a(n) for n = 1..10000</a> %e A108787 1, 10, 11, 11, 100, 101, 110, 111, 1000, 1000, 1001, 1001, ... <- sequence (base 2) %e A108787 ..1..1..0..1..1..1..1..1..0..0..1..0... <- first difference are the sequence's digits. %p A108787 A[1]:= 1: B:= 1: S:= "1": %p A108787 for n from 2 to 100 do %p A108787 B:= B + parse(S[n-1]); %p A108787 A[n]:= convert(B,binary); %p A108787 S:= cat(S,A[n]); %p A108787 od: %p A108787 seq(A[i],i=1..100); # _Robert Israel_, Jun 11 2019 %Y A108787 Cf. A108788, A108789, A108790. %Y A108787 Cf. A100787 for a similar sequence in decimal. %K A108787 base,easy,nonn %O A108787 1,2 %A A108787 _Philippe Deléham_, Jul 09 2005