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A300315
Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 16, 735, 31345, 8002885, 7221094975, 16292595627604, 134432669552429280
OFFSET
1,2
COMMENTS
Diagonal of A300321.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..0..0..0..1. .0..1..1..1..0. .0..0..0..0..0
..1..0..0..0..0. .1..1..0..0..0. .1..0..1..0..1. .0..0..0..1..1
..0..0..0..0..0. .1..1..1..1..0. .0..0..1..1..1. .0..0..0..1..1
..0..1..0..1..1. .1..0..0..0..0. .1..0..1..1..1. .1..1..1..1..1
..1..0..0..0..0. .1..0..0..0..0. .1..0..1..1..1. .1..1..0..1..0
CROSSREFS
Cf. A300321.
Sequence in context: A218644 A013179 A144177 * A361196 A355550 A296628
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 02 2018
STATUS
approved