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A303793 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero. 0
1, 4, 17, 90, 562, 5282, 15478, 394667, 587035, 47608207, 23125171, 8706714125, 1066431672, 2470846969189, 56568350211, 1133933765289063, 3650604967363 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303800.

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303800.

Sequence in context: A135168 A058279 A143405 * A141154 A316084 A112354

Adjacent sequences:  A303790 A303791 A303792 * A303794 A303795 A303796

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 30 2018

STATUS

approved

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Last modified February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)