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a(2n+1) = |a(2n) - a(2n-1)|, a(2n) = a(n) + a(n-1).
4

%I #3 Mar 30 2012 18:55:50

%S 1,1,0,2,2,1,1,2,1,4,3,3,0,2,2,3,1,3,2,5,3,7,4,6,2,3,1,2,1,4,3,5,2,4,

%T 2,4,2,5,3,7,4,8,4,10,6,11,5,10,5,8,3,5,2,4,2,3,1,3,2,5,3,7,4,8,4,7,3,

%U 6,3,6,3,6,3,6,3,7,4,8,4,10,6,11,5,12,7,12,5,14,9,16,7,17,10,16

%N a(2n+1) = |a(2n) - a(2n-1)|, a(2n) = a(n) + a(n-1).

%Y Cf. A020947-A020950.

%K nonn

%O 1,4

%A _Clark Kimberling_