login
A306137
Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 7, 90, 4691, 601535, 173607551, 138192505287, 289978184070220, 1508303074324756219
OFFSET
1,2
COMMENTS
Diagonal of A306143.
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..0..0..1..0. .0..0..0..1..0. .0..0..0..1..0
..0..1..0..0..1. .1..0..0..1..0. .0..1..0..1..1. .1..0..0..1..0
..1..0..0..1..0. .1..1..0..0..1. .1..0..0..0..0. .1..0..1..1..1
..0..0..0..1..0. .0..1..1..0..0. .0..0..1..0..1. .1..1..1..0..1
..1..1..1..0..0. .1..0..0..0..1. .1..0..1..1..0. .0..0..1..0..1
CROSSREFS
Cf. A306143.
Sequence in context: A321164 A243699 A007820 * A226624 A266236 A123694
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 22 2018
STATUS
approved