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A320403 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
1, 6, 47, 786, 27236, 1957026, 282206549, 84346447443, 51065576746070, 63169593120391316 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A320409.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A320409.

Sequence in context: A332238 A192887 A321190 * A323138 A000252 A078237

Adjacent sequences:  A320400 A320401 A320402 * A320404 A320405 A320406

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 12 2018

STATUS

approved

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Last modified July 5 04:27 EDT 2020. Contains 335459 sequences. (Running on oeis4.)