A297882 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

1, 7, 20, 36, 114, 253, 433, 734, 1037, 1882, 2897, 4474, 4556, 9490, 7864, 13478, 31282, 20470, 123291, 55794, 102050, 328168, 112445

Offset

1,2

Comments

Diagonal of A297889.

Links

Table of n, a(n) for n=1..23.

Example

Some solutions for n=7
..0..1..0..1..1..0..1. .0..1..0..0..0..1..1. .0..0..1..0..1..1..0
..0..0..1..1..1..1..1. .1..0..1..1..1..0..0. .1..1..1..0..0..0..1
..1..1..0..0..0..0..0. .1..0..0..0..0..0..1. .0..1..0..1..0..1..0
..0..1..1..1..1..1..1. .0..0..1..1..1..0..1. .0..1..0..1..0..1..0
..0..1..0..0..0..0..0. .1..1..0..0..0..0..1. .0..1..0..1..0..1..0
..1..0..1..1..1..1..1. .0..1..1..1..1..0..0. .1..1..1..0..0..0..1
..0..1..0..1..1..0..1. .0..1..0..0..0..1..1. .0..0..1..0..1..1..0

Crossrefs

Cf. A297889.

Sequence in context: A269044 A063235 A063151 * A318790 A228882 A140676

Adjacent sequences: A297879 A297880 A297881 * A297883 A297884 A297885

Keyword

nonn

Author

R. H. Hardin, Jan 07 2018

Status

approved