A191572 - OEIS

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A191572

Number of nXn symmetric binary matrices with each 1 adjacent to no more than 4 knight-move neighboring 1s

2, 8, 64, 1024, 24975, 1117404, 98925520, 16397607520, 4973951282668, 2743737089908402, 2786025507390606149 (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..1..0..0..1..0....0..1..0..1..0..0....0..0..0..1..1..0....0..1..1..0..1..0` `..1..0..0..1..1..1....1..0..0..0..0..0....0..0..0..0..1..1....1..0..0..1..1..0` `..0..0..1..0..0..1....0..0..0..0..0..1....0..0..0..0..0..0....1..0..0..0..1..1` `..0..1..0..0..0..1....1..0..0..0..0..0....1..0..0..0..0..0....0..1..0..1..0..1` `..1..1..0..0..0..0....0..0..0..0..0..1....1..1..0..0..1..1....1..1..1..0..0..0` `..0..1..1..1..0..0....0..0..1..0..1..1....0..1..0..0..1..1....0..0..1..1..0..1`
	CROSSREFS	`Sequence in context: A153534 A153563 A178169 * A191573 A136283 A139680` `Adjacent sequences: A191569 A191570 A191571 * A191573 A191574 A191575`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Jun 06 2011`
	STATUS	`approved`

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Last modified May 20 11:47 EDT 2013. Contains 225459 sequences.