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A298655
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 40, 177, 1116, 7964, 89543, 1367704, 32451809, 1028816587
OFFSET
1,2
COMMENTS
Diagonal of A298660.
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..0..0..0..0. .0..1..1..1..1. .0..0..0..0..1
..0..1..1..1..0. .1..1..1..1..1. .0..0..1..1..0. .1..1..1..1..1
..0..1..1..1..0. .0..0..0..0..0. .1..1..1..1..0. .0..1..1..0..0
..0..1..0..1..0. .1..1..1..1..1. .1..0..0..0..1. .0..1..1..1..1
..1..0..1..0..1. .0..0..0..0..0. .0..0..0..1..0. .1..1..1..0..0
CROSSREFS
Cf. A298660.
Sequence in context: A014309 A298049 A298884 * A299608 A249835 A295938
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 24 2018
STATUS
approved