A300031 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 22, 427, 21811, 3126013, 1240303182, 1230133478378, 3123617229978787

Offset

1,2

Comments

Diagonal of A300035.

Links

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

Example

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

Crossrefs

Cf. A300035.

Sequence in context: A183408 A298322 A299215 * A271678 A002069 A298233

Adjacent sequences: A300028 A300029 A300030 * A300032 A300033 A300034

Keyword

nonn

Author

R. H. Hardin, Feb 23 2018

Status

approved