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A002564 Queens problem.
(Formerly M3199 N1293)
1
1, 4, 1, 12, 186, 4, 86, 4860 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

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.

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

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

CROSSREFS

Sequence in context: A019238 A157404 A135704 * A019428 A184753 A055252

Adjacent sequences:  A002561 A002562 A002563 * A002565 A002566 A002567

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 08:44 EST 2012. Contains 205998 sequences.