A305356 Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 13, 26, 137, 538, 4429, 33136, 321576, 4146990, 63233103

Offset

1,2

Comments

Diagonal of A305360.

Links

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

Example

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

Crossrefs

Cf. A305360.

Sequence in context: A189581 A206804 A304003 * A304946 A316616 A119652

Adjacent sequences: A305353 A305354 A305355 * A305357 A305358 A305359

Keyword

nonn

Author

R. H. Hardin, May 31 2018

Status

approved