A316372 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 13, 418, 16817, 1396959, 294007902, 118878261056, 97754857507717

Offset

1,2

Comments

Diagonal of A316376.

Links

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

Example

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

Crossrefs

Cf. A316376.

Sequence in context: A048558 A219571 A304545 * A306130 A317267 A219366

Adjacent sequences: A316369 A316370 A316371 * A316373 A316374 A316375

Keyword

nonn

Author

R. H. Hardin, Jun 30 2018

Status

approved