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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 (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

Table of n, a(n) for n=2..7.

Erich Friedman, Illustration of initial terms

CROSSREFS

Cf. A051754-A051758, A051567-A051571, A019654.

Sequence in context: A259115 A051569 A087186 * A051570 A082913 A083205

Adjacent sequences:  A051756 A051757 A051758 * A051760 A051761 A051762

KEYWORD

nonn,nice,more

AUTHOR

Robert Trent (trentrd(AT)hotmail.com), Aug 23 2000

STATUS

approved

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Last modified February 28 01:55 EST 2020. Contains 332319 sequences. (Running on oeis4.)