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 A071672 #4 Apr 30 2014 01:53:48 %S A071672 10,1100,1010,111000,110010,101100,110100,11100010,11001100,101010, %T A071672 11110000,11010010,1110001100,11001010,10111000,11100100,1111000010, %U A071672 1101001100,1110001010,1100111000,10110010,11011000,1110010010 %N A071672 The binary encoding of parenthesizations given in a "global arithmetic order", using A001477 as the packing bijection N X N -> N. %H A071672 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 A071672 Cf. A071672(n) = A063171(A071654(n)). Permutation of A063171 and A071671. Particularly, applying the automorphism ReflectBinTree (A057163) to A071672(n) yields A071671(n). The length of each term / 2: A071673. %K A071672 nonn,tabl %O A071672 1,1 %A A071672 _Antti Karttunen_, May 30 2002