A298655 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 15, 40, 177, 1116, 7964, 89543, 1367704, 32451809, 1028816587

Offset

1,2

Comments

Diagonal of A298660.

Links

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

Example

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

Crossrefs

Cf. A298660.

Sequence in context: A014309 A298049 A298884 * A299608 A249835 A295938

Adjacent sequences: A298652 A298653 A298654 * A298656 A298657 A298658

Keyword

nonn

Author

R. H. Hardin, Jan 24 2018

Status

approved