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A191571

Number of n X n symmetric binary matrices with each 1 adjacent to no more than 3 knight-move neighboring 1s

2, 8, 64, 775, 12956, 435303, 27256988, 2944205484, 528310229714, 165642950895264, 90217673507084286 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..11.`
	EXAMPLE	`Some solutions for n=6` `..0..0..1..0..1..0....1..0..1..1..0..0....0..0..0..0..1..1....0..0..0..0..1..0` `..0..0..0..1..0..1....0..0..0..0..1..0....0..0..0..0..1..0....0..0..1..0..0..0` `..1..0..1..0..0..0....1..0..0..0..1..1....0..0..0..0..1..0....0..1..0..0..0..1` `..0..1..0..0..1..0....1..0..0..0..0..0....0..0..0..0..1..0....0..0..0..0..0..0` `..1..0..0..1..1..1....0..1..1..0..1..1....1..1..1..1..0..1....1..0..0..0..0..1` `..0..1..0..0..1..0....0..0..1..0..1..0....1..0..0..0..1..1....0..0..1..0..1..1`
	CROSSREFS	`Sequence in context: A136282 A092934 A224801 * A347012 A139679 A005640` `Adjacent sequences: A191568 A191569 A191570 * A191572 A191573 A191574`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Jun 06 2011`
	STATUS	`approved`

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Last modified August 5 21:27 EDT 2024. Contains 374956 sequences. (Running on oeis4.)