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 A072739 #3 May 01 2014 02:47:42 %S A072739 0,0,1,1,2,1,0,2,3,2,1,3,4,3,2,0,2,4,5,4,3,1,3,5,6,5,4,3,0,2,4,6,7,6, %T A072739 5,4,1,3,5,7,8,7,6,5,4,0,2,4,6,8,9,8,7,6,5,1,3,5,7,9,10,9,8,7,6,5,0,2, %U A072739 4,6,8,10,11,10,9,8,7,6,1,3,5,7,9,11,12,11,10,9,8,7,6,0,2,4,6,8,10,12,13 %N A072739 Y-projection of the tabular N X N -> N bijection A072733. %o A072739 (Scheme) (define (A072739 n) (A002262 (A072732 n))) %Y A072739 The X-projection is A072738. Composition of A002262 and A072732. A072786(n) = A072782(n)-A072739(n). %K A072739 nonn,tabl %O A072739 0,5 %A A072739 _Antti Karttunen_, Jun 12 2002