A317430 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 61, 1140, 67214, 8362442, 2326497716, 1648608723762, 2852287084420935

Offset

1,2

Comments

Diagonal of A317436.

Links

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

Example

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

Crossrefs

Cf. A317436.

Sequence in context: A368324 A350157 A048287 * A145507 A254121 A047685

Adjacent sequences: A317427 A317428 A317429 * A317431 A317432 A317433

Keyword

nonn

Author

R. H. Hardin, Jul 27 2018

Status

approved