A298623 Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 1, 8, 125, 20959, 7087666, 9557110072, 42384213387355, 621075964119527775

Offset

1,3

Comments

Diagonal of A298629.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A298629.

Sequence in context: A273279 A227851 A076960 * A035130 A055762 A281714

Adjacent sequences: A298620 A298621 A298622 * A298624 A298625 A298626

Keyword

nonn

Author

R. H. Hardin, Jan 23 2018

Status

approved