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Duplicate of A000224.
0

%I #4 Jan 12 2007 03:00:00

%S 1,2,2,2,3,4,4,3,4,6,6,4,7,8,6,4,9,8,10,6,8,12,12,6,11,14

%N Duplicate of A000224.

%K dead

%O 1,2