A187720 - OEIS

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A187720

Number of (n+1)X(n+1) binary arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors

16, 174, 3698, 161571, 13555195, 2287444987, 755272970945, 491415809239410, 627561470269866658, 1574769693877593164368 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Diagonal of A187729`
	LINKS	`Table of n, a(n) for n=1..10.`
	EXAMPLE	`Some solutions for 3X3` `..0..0..1....1..0..1....1..0..1....0..1..1....1..1..1....1..0..0....1..1..1` `..1..1..1....1..1..0....1..1..0....0..1..0....0..0..1....1..0..1....0..1..0` `..0..1..0....1..1..0....1..1..1....1..1..1....1..0..1....1..1..0....1..0..0`
	CROSSREFS	`Sequence in context: A021374 A253343 A215687 * A017931 A021129 A268869` `Adjacent sequences: A187717 A187718 A187719 * A187721 A187722 A187723`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Mar 13 2011`
	STATUS	`approved`

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Last modified March 25 17:06 EDT 2023. Contains 361528 sequences. (Running on oeis4.)