A298958 Number of n X n 0..1 arrays with every element equal to 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 1, 1, 7, 31, 360, 4263, 101720, 3172536, 169440015, 12802881385, 1552491730921

Offset

1,4

Comments

Diagonal of A298963.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=5
..0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0. .0..0..0..1..1
..0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0. .0..0..0..1..1
..1..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..1
..1..1..1..0..0. .1..1..0..0..0. .1..1..1..0..0. .1..1..0..0..0
..1..1..1..0..0. .1..1..0..0..0. .1..1..1..0..0. .1..1..0..0..0

Crossrefs

Cf. A298963.

Sequence in context: A352411 A344787 A253596 * A153028 A276667 A322894

Adjacent sequences: A298955 A298956 A298957 * A298959 A298960 A298961

Keyword

nonn

Author

R. H. Hardin, Jan 30 2018

Status

approved