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A317559 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 8, 228, 20312, 5721314, 5059110002, 14085130453968, 123418919972164971, 3402595745984823716385 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A317565.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

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

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

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

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

CROSSREFS

Cf. A317565.

Sequence in context: A299655 A033508 A320365 * A302735 A300209 A300798

Adjacent sequences:  A317556 A317557 A317558 * A317560 A317561 A317562

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 31 2018

STATUS

approved

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Last modified April 8 03:43 EDT 2020. Contains 333312 sequences. (Running on oeis4.)