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A053994
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Nonattacking queens on a 2n+1 X 2n+1 toroidal board, solutions which differ only by rotation, reflection or torus shift count only once.
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6
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1, 0, 1, 1, 0, 2, 11, 0, 97, 354, 0, 31381, 395551, 0, 90120677
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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REFERENCES
| I. Rivin, I. Vardi and P. Zimmermann, The n-queens problem, Amer. Math. Monthly, 101 (1994), 629-639 (for finding the solutions).
A. P. Street and R. Day, Sequential binary arrays II: Further results on the square grid, pp. 392-418 of Combinatorial Mathematics IX. Proc. Ninth Australian Conference (Brisbane, August 1981). Ed. E. J. Billington, S. Oates-Williams and A. P. Street. Lecture Notes Math., 952. Springer-Verlag, 1982 (for getting equivalence classes).
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CROSSREFS
| A007705, A006841, A051906.
Sequence in context: A119189 A202952 A201145 * A057213 A037299 A077805
Adjacent sequences: A053991 A053992 A053993 * A053995 A053996 A053997
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KEYWORD
| hard,nice,nonn
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AUTHOR
| Matthias Engelhardt (Matthias.R.Engelhardt(AT)web.de), Apr 05 2000
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EXTENSIONS
| More terms from Matthias Engelhardt (Matthias.R.Engelhardt(AT)web.de), Jan 11 2001
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