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A303793
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.
0
1, 4, 17, 90, 562, 5282, 15478, 394667, 587035, 47608207, 23125171, 8706714125, 1066431672, 2470846969189, 56568350211, 1133933765289063, 3650604967363
OFFSET
1,2
COMMENTS
Diagonal of A303800.
EXAMPLE
Some solutions for n=5
..0..1..1..0..0. .0..1..0..1..0. .0..1..0..0..1. .0..1..1..1..1
..0..1..1..0..0. .1..0..0..0..1. .1..0..0..0..1. .0..1..1..1..1
..1..1..1..1..0. .0..0..0..0..0. .0..0..0..0..0. .1..1..1..1..1
..1..1..1..1..0. .1..0..0..0..1. .0..0..0..0..1. .1..1..1..1..1
..0..0..1..1..1. .1..0..0..1..0. .1..1..0..0..1. .1..1..0..0..1
CROSSREFS
Cf. A303800.
Sequence in context: A058279 A143405 A376159 * A141154 A347340 A355295
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 30 2018
STATUS
approved