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A304466 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 0
1, 8, 41, 322, 5063, 89071, 1802240, 101407827, 8813328376, 823379005870 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304472.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304472.

Sequence in context: A188209 A026953 A280068 * A228480 A067301 A295936

Adjacent sequences:  A304463 A304464 A304465 * A304467 A304468 A304469

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 13 2018

STATUS

approved

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)