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A303801
Number of n X n 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.
0
1, 5, 9, 38, 100, 316, 1217, 8004, 52464, 501170, 4720512, 60221097, 817581575
OFFSET
1,2
COMMENTS
Diagonal of A303808.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..1..1..1..1. .0..0..1..0..1. .0..0..0..0..1
..0..0..1..1..1. .1..1..1..1..1. .0..0..0..1..1. .0..0..0..0..0
..0..1..1..1..1. .1..1..1..1..1. .0..0..0..1..1. .0..0..0..0..0
..1..1..1..1..1. .1..1..1..1..1. .1..0..0..1..1. .0..0..0..0..1
..1..1..1..1..0. .0..1..1..1..1. .1..1..0..1..0. .1..0..0..1..1
CROSSREFS
Cf. A303808.
Sequence in context: A200376 A098477 A243762 * A304849 A270622 A270673
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 30 2018
STATUS
approved