A298214 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.

1, 7, 20, 120, 2066, 25717, 1261845, 72407248, 7205019743, 1633990811314

Offset

1,2

Comments

Diagonal of A298221.

Links

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

Example

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

Crossrefs

Cf. A298221.

Sequence in context: A299181 A299944 A265657 * A299346 A009370 A299091

Adjacent sequences: A298211 A298212 A298213 * A298215 A298216 A298217

Keyword

nonn

Author

R. H. Hardin, Jan 15 2018

Status

approved