%I #7 Mar 11 2014 01:32:48
%S 0,1,3,4,2,7,5,6,10,9,8,12,13,14,16,17,18,19,11,15,24,28,27,23,22,21,
%T 30,20,25,29,33,31,26,34,32,42,45,36,46,35,48,40,47,39,52,38,37,53,51,
%U 55,44,49,41,54,57,63,58,59,43,50,60,72,61,65,64,68,73,69,56,78,66,75,76
%N a(0)=0. For n >= 1, a(n) = (A084758(n+1)A084758(n))/2.
%C Is this sequence a permutation of the nonnegative integers?
%Y Cf. A084758
%K nonn
%O 0,3
%A _Leroy Quet_, Oct 06 2009
%E Terms beyond a(7) from _R. J. Mathar_, Jan 25 2010
