login
A299384
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 46, 310, 1002, 4929, 28917, 170693, 1255834, 10402982, 92718038
OFFSET
1,2
COMMENTS
Diagonal of A299388.
EXAMPLE
Some solutions for n=7
..0..1..0..1..1..0..1. .0..0..1..0..1..0..1. .0..0..1..0..0..1..1
..0..1..0..0..0..1..0. .1..1..0..1..0..0..1. .1..0..1..1..0..1..0
..0..1..0..0..0..1..1. .0..1..1..1..0..1..0. .0..0..1..1..0..0..0
..1..0..0..0..0..0..0. .1..0..0..0..0..1..0. .1..1..1..1..1..1..1
..1..0..1..0..1..0..1. .0..1..0..0..0..1..0. .0..1..0..1..1..1..0
..0..1..0..0..0..1..1. .0..1..0..0..0..0..1. .0..1..0..1..1..1..0
..1..1..0..1..1..0..0. .0..1..0..1..1..1..0. .0..1..0..1..0..0..1
CROSSREFS
Cf. A299388.
Sequence in context: A159222 A100206 A298288 * A007044 A047862 A264879
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2018
STATUS
approved