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A051754
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Consider problem of placing N queens on an n X n board so that each queen attacks precisely 1 other. Sequence gives maximal number of queens.
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12
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OFFSET
| 2,1
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COMMENTS
| 2*[2n/3] is an upper bound for a(n), which is achieved for n=2, 4 and 6-14. - Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Aug 12 2001
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REFERENCES
| Martin Gardner, The Last Recreations, Copernicus, NY, 1997, 274-283.
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CROSSREFS
| Cf. A051755-A051759, A051567-A051571, A019654.
Sequence in context: A190172 A059867 A046971 * A108747 A116931 A145810
Adjacent sequences: A051751 A051752 A051753 * A051755 A051756 A051757
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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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