%I A002565 M1313 N0502
%S A002565 0,2,5,3,15,140,5,56
%N A002565 Queens problem.
%D A002565 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002565 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002565 M. A. Sainte-Lagu\"{e}, Les R\'{e}seaux (ou Graphes)}, M\'{e}morial des 
               Sciences Math\'{e}matiques, Fasc. 18, Gauthier-Villars, Paris, 1926, 
               p. 49.
%Y A002565 Sequence in context: A091265 A028415 A035334 this_sequence A063703 A109619 
               A087228
%Y A002565 Adjacent sequences: A002562 A002563 A002564 this_sequence A002566 A002567 
               A002568
%K A002565 nonn
%O A002565 1,2
%A A002565 N. J. A. Sloane (njas(AT)research.att.com).