A304849 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

1, 5, 9, 38, 148, 762, 6750, 97917, 1725334, 42688289, 1433354938

Offset

1,2

Comments

Diagonal of A304855.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A304855.

Sequence in context: A098477 A243762 A303801 * A270622 A270673 A269702

Adjacent sequences: A304846 A304847 A304848 * A304850 A304851 A304852

Keyword

nonn

Author

R. H. Hardin, May 19 2018

Status

approved