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 A071671 #3 Apr 30 2014 01:53:48 %S A071671 10,1010,1100,101010,110010,110100,101100,11001010,11010010,111000, %T A071671 10101010,11001100,1101001010,11100010,11010100,10110010,1100101010, %U A071671 1101001100,1110001010,1101010010,11100100,10110100,1100110010 %N A071671 The binary encoding of parenthesizations given in a "global arithmetic order", using A061579 as the packing bijection N X N -> N. %H A071671 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (Includes the complete Scheme source for computing this sequence) %Y A071671 a(n) = A063171(A071652(n)). Permutation of A063171 and A071672. In particular, applying the automorphism ReflectBinTree (A057163) to A071671(n) yields A071672(n). The length of each term / 2 gives A071673. %K A071671 nonn,tabl %O A071671 1,1 %A A071671 _Antti Karttunen_, May 30 2002