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A304264 Number of n X n 0..1 arrays with every element unequal to 0, 1, 5 or 8 king-move adjacent elements, with upper left element zero. 1
1, 1, 6, 21, 146, 1246, 13767, 252509, 5755625, 177353720, 8354131403, 523250794396, 44173651472383, 5428616779817049, 920678621074132173, 212277158481925445968, 69198443091508695982216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A304270.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..22

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A304270.

Sequence in context: A318103 A058821 A054366 * A210443 A179768 A131960

Adjacent sequences:  A304261 A304262 A304263 * A304265 A304266 A304267

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 09 2018

STATUS

approved

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Last modified December 8 14:41 EST 2021. Contains 349596 sequences. (Running on oeis4.)