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A297851
Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 30, 45, 131, 181, 298, 430, 1022, 1429, 2164, 2135, 4620, 3680, 9110, 11981, 9540, 87199, 22330, 77938, 182912, 34081
OFFSET
1,2
COMMENTS
Diagonal of A297858.
EXAMPLE
Some solutions for n=7
..0..0..1..1..1..0..1. .0..0..1..1..0..1..0. .0..1..1..0..0..1..1
..1..1..0..0..0..1..0. .1..1..0..0..1..0..0. .1..0..0..1..1..0..0
..0..1..1..1..1..1..0. .0..0..0..1..0..1..1. .0..1..0..0..0..0..1
..0..1..0..0..0..1..1. .1..1..0..1..0..0..0. .0..1..0..1..1..0..1
..0..1..1..1..1..0..0. .0..1..0..0..1..0..1. .0..1..0..0..0..0..1
..1..1..0..0..0..0..1. .1..0..1..0..1..0..1. .1..0..0..1..1..0..0
..0..0..1..1..1..0..1. .1..0..0..0..1..0..1. .0..1..1..0..0..1..1
CROSSREFS
Cf. A297858.
Sequence in context: A039666 A020493 A087183 * A298088 A290325 A271326
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2018
STATUS
approved