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A299655
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
1, 8, 227, 22087, 7411398, 8607101770, 34546300829517, 478911551660693464, 22930235691929943217996
OFFSET
1,2
COMMENTS
Diagonal of A299661.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..1..0..1..0. .0..1..0..0..1. .0..0..0..0..0. .0..0..1..1..1
..1..0..1..1..1. .0..1..1..1..1. .0..0..1..0..0. .1..1..1..1..0
..0..0..0..1..1. .0..0..0..1..0. .1..1..1..0..1. .0..0..0..0..1
..1..0..0..0..0. .1..0..1..0..1. .0..1..0..0..1. .0..1..0..0..0
CROSSREFS
Cf. A299661.
Sequence in context: A193786 A213799 A316809 * A033508 A320365 A317559
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2018
STATUS
approved