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%I #7 Mar 30 2012 17:22:10
%S 0,0,3,7,26,78,266,752,2291,6332,17415,47313,126061,331121
%N Number of primitive Heron triangles with diameter <= 2^n.
%D W. D. Smith, Posting to Math Fun Mailing List, Dec 05 2011.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Mar 04 2012
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