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A298288
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 46, 308, 990, 4679, 26963, 153319, 1074940, 8523830, 71415327
OFFSET
1,2
COMMENTS
Diagonal of A298294.
EXAMPLE
Some solutions for n=7
..0..0..0..1..0..0..1. .0..1..0..1..0..0..1. .0..1..1..1..0..1..0
..0..1..0..1..1..0..1. .1..1..0..0..1..1..1. .0..1..0..1..0..0..1
..0..0..0..1..1..0..0. .0..0..0..1..1..0..0. .1..0..1..1..0..0..0
..1..1..1..1..1..1..1. .0..1..1..0..1..0..1. .0..0..1..0..1..1..1
..0..1..1..1..0..1..0. .0..0..1..1..1..0..0. .1..1..1..0..1..1..0
..1..0..1..0..1..1..1. .0..0..1..0..1..1..1. .0..0..1..1..1..1..0
..1..0..1..0..1..0..0. .0..1..1..0..1..0..0. .1..0..1..0..1..1..1
CROSSREFS
Cf. A298294.
Sequence in context: A011934 A159222 A100206 * A299384 A007044 A047862
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 16 2018
STATUS
approved