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 A115848 #2 Mar 31 2012 13:21:10 %S A115848 0,1,10,11,100,101,110,111,1000,1001,1010,1011,1100,1101,1110,1111, %T A115848 10000,10010,10100,10110,11000,11010,11100,11110,100000,100001,100100, %U A115848 100101,101000,101001,101100,101101,110000,110100,111000,111100 %N A115848 Sequence A115847 in binary. %Y A115848 Cf. a(n) = A007088(A115847(n)). Differs from A007088 (Numbers written in base 2) for the first time at n=17. %K A115848 nonn,base %O A115848 0,3 %A A115848 _Antti Karttunen_, Feb 01 2006