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A297900 Number of nXn 0..1 arrays with every element equal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero. 0
1, 4, 1, 37, 281, 257, 23911, 1367645, 10485521, 4553534006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297907.

LINKS

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

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297907.

Sequence in context: A011801 A169656 A303987 * A298495 A193962 A302441

Adjacent sequences:  A297897 A297898 A297899 * A297901 A297902 A297903

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 08 2018

STATUS

approved

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Last modified November 19 20:42 EST 2019. Contains 329323 sequences. (Running on oeis4.)