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%I #2 May 01 2014 02:47:42
%S 0,1,1,2,2,0,2,3,3,1,3,4,4,2,0,3,4,5,5,3,1,4,5,6,6,4,2,0,4,5,6,7,7,5,
%T 3,1,5,6,7,8,8,6,4,2,0,5,6,7,8,9,9,7,5,3,1,6,7,8,9,10,10,8,6,4,2,0,6,
%U 7,8,9,10,11,11,9,7,5,3,1,7,8,9,10,11,12,12,10,8,6,4,2,0,7,8,9,10,11,12,13
%N X-projection of the tabular N X N -> N bijection A072733.
%o (Scheme) (define (A072738 n) (A025581 (A072732 n)))
%Y The Y-projection is A072739. Composition of A025581 & A072732. A072785(n) = A072781(n)-A072738(n).
%K nonn,tabl
%O 0,4
%A _Antti Karttunen_, Jun 12 2002