A299880 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 10, 247, 3127, 223094, 56762816, 20496493815, 32439092859262

Offset

1,2

Comments

Diagonal of A299886.

Links

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

Example

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

Crossrefs

Cf. A299886.

Sequence in context: A102958 A321795 A220197 * A358928 A379138 A085649

Adjacent sequences: A299877 A299878 A299879 * A299881 A299882 A299883

Keyword

nonn

Author

R. H. Hardin, Feb 21 2018

Status

approved