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A304224 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2 or 7 king-move adjacent elements, with upper left element zero. 0
1, 4, 5, 11, 31, 306, 5541, 82029, 1842555, 145751601, 13209632311, 1320863549350, 329852488741611, 141595185654330078, 73958909238062935027 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304230.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=5

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

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

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

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

CROSSREFS

Cf. A304230.

Sequence in context: A216963 A259821 A109503 * A304135 A251240 A305041

Adjacent sequences:  A304221 A304222 A304223 * A304225 A304226 A304227

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 08 2018

STATUS

approved

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Last modified June 20 15:28 EDT 2021. Contains 345165 sequences. (Running on oeis4.)