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A306137 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 0
0, 7, 90, 4691, 601535, 173607551, 138192505287, 289978184070220, 1508303074324756219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A306143.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A306143.

Sequence in context: A321164 A243699 A007820 * A226624 A266236 A123694

Adjacent sequences:  A306134 A306135 A306136 * A306138 A306139 A306140

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 22 2018

STATUS

approved

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Last modified July 17 14:44 EDT 2019. Contains 325106 sequences. (Running on oeis4.)