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A297078
Number of n X n 0..1 arrays with no 1 adjacent to 2 king-move neighboring 1's.
0
2, 12, 136, 6784, 1180260, 833228038, 2245841563645, 22323064130902079, 816825481568045498590, 109415592103170263245191759
OFFSET
1,1
COMMENTS
Diagonal of A297085.
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..0..0. .0..1..1..1..0. .0..0..1..1..0. .0..1..0..1..0
..1..1..0..0..0. .1..0..1..1..1. .0..0..1..1..1. .0..1..0..1..1
..0..0..0..0..1. .1..1..0..1..0. .1..0..0..0..1. .1..1..1..1..1
..0..1..0..0..1. .1..1..1..0..1. .0..0..0..1..0. .1..1..1..1..1
CROSSREFS
Cf. A297085.
Sequence in context: A108996 A117513 A343439 * A185522 A119819 A330655
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 25 2017
STATUS
approved