A305176 Number of n X n 0..1 arrays with every element unequal to 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 8, 10, 64, 473, 1750, 24506, 370094, 4653537, 164815846, 6321406578

Offset

1,2

Comments

Diagonal of A305182.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A305182.

Sequence in context: A032914 A088072 A213033 * A046545 A279585 A372630

Adjacent sequences: A305173 A305174 A305175 * A305177 A305178 A305179

Keyword

nonn

Author

R. H. Hardin, May 26 2018

Status

approved