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 A091447 #5 Aug 19 2015 15:06:26 %S A091447 0,1,0,0,0,1,1,0,1,1,0,0,0,0,0,1,0,1,0,1,0,0,0,1,1,1,0,1,1,1,0,1,1,1, %T A091447 0,0,0,0,0,0,0,1,0,0,1,0,0,1,0,0,1,0,0,0,0,0,1,1,0,1,0,1,1,0,0,1,0,1, %U A091447 1,0,1,0,1,0,1,1,0,0,0,1,1,1,1,0,1,1,1,1,0,1,1,1,1,0,1,1,1,1 %N A091447 Concatenate binary vectors ordered first by length, then by the number of 1's and finally by an 'unusual' lexicographical ordering (read words from right to left, 1 comes before 0). %Y A091447 Cf. A076478, A091444, A091445, A091446. %K A091447 easy,nonn %O A091447 0,1 %A A091447 _Paul Boddington_, Jan 10 2004