A305277 Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 11, 166, 1185, 26577, 342596, 9804507, 220905716, 9470663034, 400580293516

Offset

1,2

Comments

Diagonal of A305281.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A305281.

Sequence in context: A119571 A089920 A303881 * A118197 A092658 A304888

Adjacent sequences: A305274 A305275 A305276 * A305278 A305279 A305280

Keyword

nonn

Author

R. H. Hardin, May 29 2018

Status

approved