login
A299568
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 78, 766, 17389, 784334, 46965400, 5736969146, 1349947112124
OFFSET
1,2
COMMENTS
Diagonal of A299574.
EXAMPLE
Some solutions for n=6
..0..1..0..0..0..1. .0..1..1..0..1..0. .0..1..0..0..0..1. .0..0..0..0..1..0
..0..0..1..1..1..0. .0..0..0..0..1..0. .0..0..1..1..1..0. .1..0..0..0..0..1
..0..0..1..1..1..0. .1..1..0..0..0..1. .0..0..1..1..1..1. .0..1..1..1..1..0
..1..0..1..1..1..0. .0..0..0..0..0..1. .0..0..1..1..1..1. .0..1..1..1..0..1
..1..1..1..0..1..1. .1..0..0..0..0..1. .0..0..1..0..1..1. .0..1..1..1..1..0
..0..0..0..1..0..0. .1..1..0..0..1..0. .0..1..1..0..0..1. .1..0..0..0..0..1
CROSSREFS
Cf. A299574.
Sequence in context: A297952 A298771 A298576 * A031884 A337284 A186942
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2018
STATUS
approved