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A298661 Number of nXn 0..1 arrays with every element equal to 0, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 0
1, 1, 3, 2, 20, 169, 978, 22938, 329249, 12541065, 628713833 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A298667.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=8

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

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

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

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

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

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

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

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

CROSSREFS

Cf. A298667.

Sequence in context: A009028 A009022 A009033 * A323780 A248123 A018872

Adjacent sequences:  A298658 A298659 A298660 * A298662 A298663 A298664

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 24 2018

STATUS

approved

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Last modified January 29 01:49 EST 2020. Contains 331328 sequences. (Running on oeis4.)