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A298661
Number of n X n 0..1 arrays with every element equal to 0, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
1, 1, 3, 2, 20, 169, 978, 22938, 329249, 12541065, 628713833
OFFSET
1,3
COMMENTS
Diagonal of A298667.
EXAMPLE
Some solutions for n=8
..0..0..1..0..0..0..0..1. .0..0..1..0..0..0..0..1. .0..0..0..0..1..0..0..1
..0..0..0..0..1..0..0..0. .0..0..0..0..1..0..0..0. .0..0..1..0..0..0..0..0
..0..1..0..0..0..0..0..1. .0..1..0..0..0..0..0..0. .1..0..0..0..0..0..0..0
..0..0..0..0..1..0..0..0. .0..0..0..0..0..0..1..1. .0..0..0..0..1..0..1..1
..0..1..0..0..0..0..1..0. .0..0..0..1..0..0..1..1. .0..0..1..1..1..1..1..1
..0..0..0..0..0..0..0..0. .0..1..0..0..0..0..0..0. .1..1..1..1..1..1..1..0
..0..0..1..0..0..1..0..0. .0..0..0..0..1..0..0..0. .1..1..1..1..0..1..1..1
..1..0..0..0..0..0..0..1. .0..0..1..0..0..0..0..1. .0..1..0..1..1..1..1..0
CROSSREFS
Cf. A298667.
Sequence in context: A009028 A009022 A009033 * A323780 A350290 A248123
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 24 2018
STATUS
approved