A305169 - OEIS

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A305169

Number of n X n 0..1 arrays with every element unequal to 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 4, 410, 26810, 2549718, 1069089450, 830801270567, 1384315836778981 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Diagonal of A305175.`
	LINKS	`Table of n, a(n) for n=1..9.`
	EXAMPLE	`Some solutions for n=5` `..0..0..1..0..0. .0..0..1..1..1. .0..0..0..1..0. .0..1..1..1..0` `..1..1..1..1..1. .1..1..1..0..0. .1..1..0..0..1. .1..0..0..1..0` `..1..0..0..1..1. .1..0..1..1..0. .0..0..0..0..0. .1..1..1..1..1` `..0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..0. .1..0..1..0..0` `..1..1..0..1..1. .1..0..0..1..0. .1..1..1..0..1. .1..0..1..0..1`
	CROSSREFS	`Cf. A305175.` `Sequence in context: A304150 A305505 A069970 * A316759 A334471 A153063` `Adjacent sequences: A305166 A305167 A305168 * A305170 A305171 A305172`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, May 26 2018`
	STATUS	`approved`

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Last modified December 10 11:36 EST 2023. Contains 367710 sequences. (Running on oeis4.)