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A299887 Number of nXn 0..1 arrays with every element equal to 0, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 5, 31, 1308, 135586, 55414033, 85265831295, 430615712168102, 7378237279248881087 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A299893.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A299893.

Sequence in context: A228647 A059301 A225158 * A088548 A244622 A278574

Adjacent sequences:  A299884 A299885 A299886 * A299888 A299889 A299890

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 21 2018

STATUS

approved

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Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)