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A051759 Consider the problem of placing A051756(n) queens on an n X n board so that each queen attacks precisely 3 others. Sequence gives number of solutions up to square symmetry. 13
1, 2, 4, 31, 307, 2, 9, 755 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
COMMENTS
A051569 (taken from the Martin Gardner references) is another version of this sequence. - N. J. A. Sloane, May 22 2014
REFERENCES
M. Gardner, The Last Recreations, Springer, 1997, p. 282.
M. Gardner, The Colossal Book of Mathematics, 2001, p. 209.
LINKS
Sean A. Irvine, Java program (github)
CROSSREFS
Sequence in context: A259115 A051569 A087186 * A051570 A082913 A083205
KEYWORD
nonn,nice,more
AUTHOR
Robert Trent (trentrd(AT)hotmail.com), Aug 23 2000
EXTENSIONS
a(8)-a(9) from Sean A. Irvine, Oct 01 2021
STATUS
approved

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)