A316870 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 99, 2931, 191678, 30894538, 11836970493, 10702669011883, 23392038065623330

Offset

1,2

Comments

Diagonal of A316876.

Links

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

Example

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

Crossrefs

Cf. A316876.

Sequence in context: A286841 A356440 A367445 * A181034 A324067 A083227

Adjacent sequences: A316867 A316868 A316869 * A316871 A316872 A316873

Keyword

nonn

Author

R. H. Hardin, Jul 15 2018

Status

approved