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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.
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%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_