A300308 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 7, 20, 211, 15171, 1676663, 543024998, 558233828840, 1538341448830389

Offset

1,2

Comments

Diagonal of A300314.

Links

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

Example

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

Crossrefs

Cf. A300314.

Sequence in context: A299009 A299800 A299676 * A344849 A216457 A266048

Adjacent sequences: A300305 A300306 A300307 * A300309 A300310 A300311

Keyword

nonn

Author

R. H. Hardin, Mar 02 2018

Status

approved