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A051758 Consider problem of placing A051755(n) queens on an n X n board so that each queen attacks precisely 2 others. Sequence gives number of solutions up to square symmetry. 2
1, 4, 2, 1, 1, 5, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..8.

CROSSREFS

Cf. A051754-A051759, A051567-A051571, A019654.

Sequence in context: A293424 A152145 A288251 * A024553 A051568 A016509

Adjacent sequences:  A051755 A051756 A051757 * A051759 A051760 A051761

KEYWORD

nonn,nice,more

AUTHOR

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

STATUS

approved

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Last modified February 29 06:46 EST 2020. Contains 332355 sequences. (Running on oeis4.)