A299608 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 15, 40, 179, 1223, 13490, 231838, 6506278, 335604816

Offset

1,2

Comments

Diagonal of A299612.

Links

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

Example

Some solutions for n=6
..0..1..1..0..0..0. .0..0..1..0..1..1. .0..0..1..0..1..0. .0..0..1..1..0..1
..0..0..0..0..0..1. .1..0..1..0..0..1. .1..0..1..0..1..0. .1..1..1..1..1..0
..0..0..0..0..0..1. .1..1..1..1..1..1. .1..0..0..0..0..1. .0..0..1..1..1..1
..1..0..0..0..0..0. .1..1..1..1..1..1. .0..1..0..0..0..0. .1..0..1..1..1..1
..1..0..0..1..0..0. .0..1..1..1..1..0. .0..1..0..0..0..0. .0..1..0..0..1..0
..1..0..1..0..1..0. .1..0..1..1..0..1. .0..1..0..1..1..0. .1..0..1..0..1..0

Crossrefs

Cf. A299612.

Sequence in context: A298049 A298884 A298655 * A249835 A295938 A096742

Adjacent sequences: A299605 A299606 A299607 * A299609 A299610 A299611

Keyword

nonn

Author

R. H. Hardin, Feb 14 2018

Status

approved