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A297087
Number of n X n 0..1 arrays with no 1 adjacent to 3 king-move neighboring 1's.
0
2, 15, 228, 11925, 1850693, 859032804, 1280846320436, 6177627821053539, 97264292901092631884
OFFSET
1,1
COMMENTS
Diagonal of A297094.
EXAMPLE
Some solutions for n=4
..0..0..0..0. .0..0..1..0. .0..0..0..1. .1..0..1..0. .0..0..0..1
..0..0..0..0. .0..0..1..0. .0..0..0..1. .1..1..0..1. .0..0..1..0
..1..0..0..1. .1..0..1..0. .0..0..1..0. .1..1..0..0. .1..0..0..0
..1..0..0..0. .0..0..0..1. .0..0..0..1. .1..0..0..1. .0..1..1..0
CROSSREFS
Cf. A297094.
Sequence in context: A145168 A184357 A090301 * A247660 A197236 A097628
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 25 2017
STATUS
approved