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Duplicate of A001971.
0

%I #4 May 11 2007 03:00:00

%S 0,0,1,1,2,3,5,6,8,10,13,15,18,21,25,28,32,36,41,45,50,55,61,66,72,78

%N Duplicate of A001971.

%K dead

%O 0,5