%I #6 Mar 30 2012 18:56:32
%S 0,0,0,1,0,1,2,2,1,0,1,3,2,1,0,1,0,1,2,1,0,1,2,1,0,1,2,1,0,1,2,2,1,0,
%T 1,2,1,0,1,2,1,0,1,2,1,0,1,3,2,1,0,3,2,1,0,3,2,1,0,3,2,1,0,1,0,1,2,2,
%U 1,2,3,3,2,3,4,4,3,4,5,2,1,2,3,1,0,1,2,2,1,2
%N a(n)=(1/2)*Sum{|d(i)-e(i)|} where Sum{d(i)*4^i} is the base 4 representation of n and e(i) are the digits d(i) in reverse order.
%K nonn,base
%O 1,7
%A _Clark Kimberling_