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A300031
Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 5, 22, 427, 21811, 3126013, 1240303182, 1230133478378, 3123617229978787
OFFSET
1,2
COMMENTS
Diagonal of A300035.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..0..0..0. .0..1..0..0..1. .0..0..1..1..0
..0..1..1..0..0. .0..1..1..0..1. .1..1..0..1..1. .0..0..0..1..1
..0..0..1..0..0. .0..1..0..0..0. .0..0..1..0..0. .0..1..0..0..1
..1..1..0..1..1. .0..1..0..1..1. .0..1..0..0..1. .1..1..0..1..1
..0..1..1..1..0. .0..0..1..1..1. .0..0..1..1..1. .1..1..0..0..1
CROSSREFS
Cf. A300035.
Sequence in context: A183408 A298322 A299215 * A271678 A002069 A298233
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2018
STATUS
approved