1,4

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

P. B. Gibbons and J. A. Webb, Some new results for the queens domination problem, Australasian Journal of Combinatorics 15 (1997), pp. 145-160.

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.

A075324 gives number of queens required.

Sequence in context: A009804 A027607 A100680 this_sequence A000528 A074970 A087338

Adjacent sequences: A002564 A002565 A002566 this_sequence A002568 A002569 A002570

nonn

N. J. A. Sloane (njas(AT)research.att.com).

a(9) corrected by Peter Gibbons, May 30 2004.