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A317267 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 4, 13, 498, 31878, 3234635, 1396521994, 1165304769027, 2212187815200032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A317271.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317271.

Sequence in context: A304545 A316372 A306130 * A219366 A270638 A182439

Adjacent sequences:  A317264 A317265 A317266 * A317268 A317269 A317270

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 25 2018

STATUS

approved

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Last modified June 27 16:27 EDT 2022. Contains 354896 sequences. (Running on oeis4.)