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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
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: A353548 A192887 A321190 * A354067 A357430 A323138
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 12 2018
STATUS
approved

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Last modified April 13 09:16 EDT 2024. Contains 371640 sequences. (Running on oeis4.)