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A318208 Number of nXn 0..1 arrays with every element unequal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 4, 69, 1042, 28010, 1122773, 93034400, 12949799902, 3077725091253 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A318214.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A318214.

Sequence in context: A052323 A012087 A012194 * A341851 A132414 A041171

Adjacent sequences:  A318205 A318206 A318207 * A318209 A318210 A318211

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 21 2018

STATUS

approved

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Last modified May 9 08:52 EDT 2021. Contains 343699 sequences. (Running on oeis4.)