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A051757
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Consider problem of placing A051754(n) queens on an n X n board so that each queen attacks precisely 1 other. Sequence gives number of solutions up to square symmetry.
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1
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OFFSET
| 2,1
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COMMENTS
| When n is a multiple of 3, the bound of 2[2n/3] queens is so tight that in solutions with that number of queens, all attacks must be along rows or columns, making solutions rare. - Jud McCranie
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REFERENCES
| Martin Gardner, The Last Recreations, Copernicus, 1997, 274-283.
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CROSSREFS
| Cf. A051754-A051759, A051567-A051571, A019654.
Sequence in context: A180510 A152555 A094360 * A193746 A070524 A021366
Adjacent sequences: A051754 A051755 A051756 * A051758 A051759 A051760
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KEYWORD
| nonn,nice
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AUTHOR
| Robert Trent (trentrd(AT)hotmail.com), Aug 23 2000
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EXTENSIONS
| More terms from Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Aug 14 2001
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