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A298616
Number of n X n 0..1 arrays with every element equal to 1, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
0, 4, 0, 83, 1893, 32834, 10823065, 4673855921, 3376311711594
OFFSET
1,2
COMMENTS
Diagonal of A298622.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..1..0..0..0. .0..0..0..1..1. .0..0..0..0..0
..0..0..0..1..1. .0..1..0..0..0. .0..0..0..1..1. .1..1..0..0..0
..0..0..1..0..1. .1..1..1..0..0. .0..0..1..0..0. .1..1..1..0..0
..1..0..1..1..1. .1..0..1..1..1. .0..1..1..0..0. .0..0..1..1..1
..0..1..1..1..1. .0..1..1..0..0. .0..1..1..0..0. .1..1..1..0..0
CROSSREFS
Cf. A298622.
Sequence in context: A228557 A373766 A358294 * A366828 A337112 A357560
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 23 2018
STATUS
approved