A316233 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 14, 105, 1867, 42075, 10057887, 5109468434, 4994868880193

Offset

1,2

Comments

Diagonal of A316239.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A316239.

Sequence in context: A184439 A370006 A375521 * A317154 A283785 A267351

Adjacent sequences: A316230 A316231 A316232 * A316234 A316235 A316236

Keyword

nonn

Author

R. H. Hardin, Jun 27 2018

Status

approved