1,4

W. W. R. Ball and H. S. M. Coxeter,"Math'l Rec. and Essays," 13th Ed. Dover, p. 173.

Matthew D. Kearse and Peter B. Gibbons, "Computational Methods and New Results for Chessboard Problems", Australasian Journal of Combinatorics 23 (2001), 253-284.

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.

A075458 gives number of queens required.

Sequence in context: A080807 A006268 A073236 this_sequence A140448 A128061 A116184

Adjacent sequences: A002560 A002561 A002562 this_sequence A002564 A002565 A002566

nonn

njas