A298896 Number of n X n 0..1 arrays with every element equal to 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 1, 1, 4, 32, 963, 44186, 9994726, 4485120457, 6962969227448

Offset

1,4

Comments

Diagonal of A298902.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A298902.

Sequence in context: A136471 A243918 A370544 * A231991 A028369 A081790

Adjacent sequences: A298893 A298894 A298895 * A298897 A298898 A298899

Keyword

nonn

Author

R. H. Hardin, Jan 28 2018

Status

approved