A051758 - OEIS

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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.

1, 4, 2, 1, 1, 5, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	CROSSREFS	`Cf. A051754-A051759, A051567-A051571, A019654.` `Sequence in context: A097526 A051149 A152145 * 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`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.