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A298896
Number of n X n 0..1 arrays with every element equal to 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
0
0, 1, 1, 4, 32, 963, 44186, 9994726, 4485120457, 6962969227448
OFFSET
1,4
COMMENTS
Diagonal of A298902.
EXAMPLE
Some solutions for n=5
..0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..1..1
..0..0..1..1..1. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..1..1
..0..1..1..1..1. .1..1..1..1..1. .1..1..0..1..1. .1..1..1..0..0
..0..0..1..1..1. .1..1..1..0..0. .1..1..0..0..0. .1..1..1..0..0
..0..0..1..1..1. .1..1..1..0..0. .1..1..0..0..0. .1..1..1..0..0
CROSSREFS
Cf. A298902.
Sequence in context: A136471 A243918 A370544 * A231991 A028369 A081790
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 28 2018
STATUS
approved