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a(n)=(1/2)*Sum{|d(i)-e(i)|} where Sum{d(i)*6^i} is the base 6 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 0,0,0,0,0,1,0,1,2,3,4,2,1,0,1,2,3,3,2,1,0,1,2,4,3,2,1,0,1,5,4,3,2,1,

%T 0,1,0,1,2,3,4,1,0,1,2,3,4,1,0,1,2,3,4,1,0,1,2,3,4,1,0,1,2,3,4,1,0,1,

%U 2,3,4,2,1,0,1,2,3,2,1,0,1,2,3,2,1,0,1,2,3,2

%N a(n)=(1/2)*Sum{|d(i)-e(i)|} where Sum{d(i)*6^i} is the base 6 representation of n and e(i) are the digits d(i) in reverse order.

%K nonn,base

%O 1,9

%A _Clark Kimberling_