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Duplicate of A008619.
0

%I #8 Oct 04 2019 07:52:53

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

%N Duplicate of A008619.

%K dead

%O 1,3