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A299944 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 7, 20, 75, 644, 4604, 116051, 5133698, 330723200, 54246156735 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A299948.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A299948.

Sequence in context: A196584 A301777 A299181 * A265657 A298214 A299346

Adjacent sequences:  A299941 A299942 A299943 * A299945 A299946 A299947

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 22 2018

STATUS

approved

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Last modified September 21 20:10 EDT 2021. Contains 347598 sequences. (Running on oeis4.)