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A298488
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 41, 178, 388, 628, 1708, 2860, 4002, 9979, 17394, 15401, 63332, 135334, 82102, 702695, 2582167, 1191816, 17532272, 141444005, 38062610
OFFSET
1,2
COMMENTS
Diagonal of A298494.
EXAMPLE
Some solutions for n=9
..0..0..1..0..0..0..1..1..1. .0..1..1..1..1..0..1..0..0
..1..0..1..0..1..0..1..0..1. .0..0..0..0..0..1..0..1..1
..1..0..0..0..1..1..1..0..0. .1..1..0..0..1..0..1..0..1
..1..0..0..0..1..1..1..0..0. .1..0..0..0..0..1..0..1..1
..1..0..1..0..1..0..1..0..1. .1..1..1..1..1..0..1..0..0
..0..0..1..1..1..0..1..1..1. .0..0..1..1..0..1..0..1..0
..0..0..1..1..1..0..1..1..1. .1..1..1..1..1..0..1..0..0
..1..0..1..0..1..0..1..0..1. .1..0..0..0..0..1..0..1..1
..0..0..1..1..1..0..1..1..1. .1..1..0..0..1..0..1..0..1
CROSSREFS
Cf. A298494.
Sequence in context: A100752 A162024 A143058 * A175428 A232599 A011934
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 20 2018
STATUS
approved