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Duplicate of A081145.
0

%I #5 May 11 2007 03:00:00

%S 1,2,4,7,3,8,14,5,12,20,6,16,27,9,21,34,10,25,41,11,28,47,13,33,54,15

%N Duplicate of A081145.

%K dead

%O 0,2