A227098 - OEIS

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A227098

Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order

2, 15, 239, 8427, 754758, 180409504 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Diagonal of A227103`
	LINKS	`Table of n, a(n) for n=1..6.`
	EXAMPLE	`Some solutions for n=4` `..0..0..1..1....0..1..0..0....0..0..0..0....0..1..1..0....0..0..1..0` `..0..1..0..0....1..0..1..0....0..0..0..1....1..1..0..1....0..0..0..0` `..1..1..1..0....1..0..0..1....1..0..1..0....1..1..0..0....1..0..0..1` `..1..1..0..0....1..0..0..1....1..0..0..0....0..0..1..1....1..1..0..1`
	CROSSREFS	`Sequence in context: A302358 A192561 A356587 * A180610 A156750 A292798` `Adjacent sequences: A227095 A227096 A227097 * A227099 A227100 A227101`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Jul 01 2013`
	STATUS	`approved`

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Last modified March 21 13:27 EDT 2023. Contains 361402 sequences. (Running on oeis4.)