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A298447
Number of n X n 0..1 arrays with every element equal to 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
0
0, 4, 0, 161, 5938, 255029, 112275165, 141892377970, 300456210546842
OFFSET
1,2
COMMENTS
Diagonal of A298454.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..0..0..0. .0..1..1..0..1. .0..0..0..0..1
..1..1..1..0..1. .1..1..0..1..1. .1..0..1..1..0. .1..1..0..0..1
..0..0..1..1..1. .1..1..1..1..1. .1..1..1..0..0. .1..1..1..0..0
..0..0..1..1..0. .0..0..0..1..1. .1..0..1..1..0. .0..0..1..0..1
..1..1..1..0..1. .0..0..0..1..1. .0..1..1..0..1. .1..1..1..1..0
CROSSREFS
Cf. A298454.
Sequence in context: A129825 A267441 A264883 * A138734 A265596 A119010
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2018
STATUS
approved