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A298771
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 78, 682, 11320, 484813, 22160831, 2093453587, 397340932476
OFFSET
1,2
COMMENTS
Diagonal of A298775.
EXAMPLE
Some solutions for n=6
..0..1..0..0..0..0. .0..1..0..0..0..1. .0..1..1..1..0..1. .0..0..0..0..0..0
..1..0..0..0..1..0. .1..0..1..1..1..0. .1..0..0..0..1..1. .0..1..0..0..0..1
..0..1..1..1..0..0. .0..0..1..1..1..0. .1..0..0..0..1..1. .0..0..1..1..1..0
..0..1..1..1..0..0. .0..0..1..1..1..0. .1..0..0..0..1..0. .0..0..1..1..1..0
..0..1..1..1..0..0. .0..1..0..0..0..1. .0..1..1..1..0..1. .1..0..1..1..1..0
..1..0..0..0..1..0. .0..0..0..0..1..0. .1..1..1..0..1..0. .0..1..0..0..0..1
CROSSREFS
Cf. A298775.
Sequence in context: A227954 A104530 A297952 * A298576 A299568 A031884
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2018
STATUS
approved