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A298162
Number of n X n 0..1 arrays with every element equal to 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
0
0, 1, 1, 4, 10, 62, 624, 95458, 6564438, 7857314649
OFFSET
1,4
COMMENTS
Diagonal of A298167.
EXAMPLE
Some solutions for n=7
..0..0..0..0..0..1..1. .0..0..0..1..1..1..1. .0..0..0..0..0..1..1
..0..0..1..0..0..1..1. .0..0..0..1..1..1..1. .0..0..1..0..0..1..1
..0..1..1..1..0..1..1. .0..0..0..1..1..1..1. .0..1..1..1..0..1..1
..0..0..1..1..1..0..0. .1..1..1..0..0..0..0. .0..0..1..1..0..1..1
..0..0..0..0..1..0..0. .1..1..1..0..0..0..0. .0..0..1..0..0..0..1
..1..1..1..0..0..1..1. .0..0..0..1..1..1..1. .0..0..1..1..0..1..1
..1..1..1..0..0..1..1. .0..0..0..1..1..1..1. .0..0..1..1..1..1..1
CROSSREFS
Cf. A298167.
Sequence in context: A124724 A362705 A323870 * A203226 A300642 A146304
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2018
STATUS
approved