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Duplicate of A073642.
0

%I #3 May 11 2007 03:00:00

%S 0,1,1,2,2,3,3,3,3,4,4,5,5,6,6,4,4,5,5,6,6,7,7,7,7,8,8,9,9,10,10,5,5,6

%N Duplicate of A073642.

%K dead

%O 1,4