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A305239 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 8 king-move adjacent elements, with upper left element zero. 0
1, 4, 18, 94, 1134, 12521, 311014, 12726939, 841464188, 99227326734, 19635419823116, 6617813957084794, 3801727775370243509 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A305245.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

..0..0..1..1..1. .0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..0

..1..1..1..1..1. .0..0..1..1..0. .1..1..1..0..1. .0..0..0..0..1

..1..1..1..0..1. .0..1..1..1..0. .1..1..1..1..1. .0..0..0..0..0

..0..1..1..1..1. .0..1..1..0..0. .0..1..1..1..1. .0..1..0..0..1

..0..1..1..1..1. .1..1..1..0..0. .1..0..1..0..0. .0..0..0..0..1

CROSSREFS

Cf. A305245.

Sequence in context: A209256 A059227 A259533 * A081103 A243325 A005777

Adjacent sequences:  A305236 A305237 A305238 * A305240 A305241 A305242

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 28 2018

STATUS

approved

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Last modified December 8 00:04 EST 2021. Contains 349590 sequences. (Running on oeis4.)