A305246 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 10, 42, 203, 1149, 9288, 110121, 1688401, 35605490, 1011275830, 38884339685

Offset

1,2

Comments

Diagonal of A305252.

Links

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

Example

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

Crossrefs

Cf. A305252.

Sequence in context: A271150 A271202 A186031 * A316546 A187877 A328605

Adjacent sequences: A305243 A305244 A305245 * A305247 A305248 A305249

Keyword

nonn

Author

R. H. Hardin, May 28 2018

Status

approved