A297908 Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

1, 5, 10, 268, 10809, 1084333, 362523451, 267640924872, 506330464341741

Offset

1,2

Comments

Diagonal of A297915.

Links

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

Example

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

Crossrefs

Cf. A297915.

Sequence in context: A067958 A373331 A248366 * A298502 A201026 A213146

Adjacent sequences: A297905 A297906 A297907 * A297909 A297910 A297911

Keyword

nonn

Author

R. H. Hardin, Jan 08 2018

Status

approved