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A304698 Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 0
0, 3, 8, 48, 908, 47440, 3510334, 799135415, 758781064050 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304704.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304704.

Sequence in context: A034183 A003216 A146161 * A306598 A019015 A305217

Adjacent sequences:  A304695 A304696 A304697 * A304699 A304700 A304701

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 17 2018

STATUS

approved

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Last modified October 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)