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Duplicate of A091524.
0

%I #3 Nov 10 2007 03:00:00

%S 1,1,2,2,3,4,3,5,4,6,7,5,8,6,9,7,10,11,8,12,9,13,14,10,15,11,16,12,17

%N Duplicate of A091524.

%K dead

%O 1,3