A302883 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 2, 37, 238, 20937, 3452246, 2899297652, 7977498513759, 75895729469717417

Offset

1,2

Comments

Diagonal of A302889.

Links

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

Example

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

Crossrefs

Cf. A302889.

Sequence in context: A139119 A244757 A298476 * A053788 A078976 A200911

Adjacent sequences: A302880 A302881 A302882 * A302884 A302885 A302886

Keyword

nonn

Author

R. H. Hardin, Apr 15 2018

Status

approved