A299575 Number of n X n 0..1 arrays with every element equal to 0, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 1, 10, 19, 172, 2597, 61273, 6245870, 1821672943, 1399272048339

Offset

1,3

Comments

Diagonal of A299581.

Links

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

Example

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

Crossrefs

Cf. A299581.

Sequence in context: A293929 A177203 A177167 * A073222 A110463 A121725

Adjacent sequences: A299572 A299573 A299574 * A299576 A299577 A299578

Keyword

nonn

Author

R. H. Hardin, Feb 13 2018

Status

approved