A302206 Number of n X n 0..1 arrays with every element equal to 0, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 2, 16, 7, 448, 1395, 55922, 3509969, 73189971, 33707749345, 2102356505182

Offset

1,2

Comments

Diagonal of A302212.

Links

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

Example

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

Crossrefs

Cf. A302212.

Sequence in context: A211367 A351585 A220314 * A110008 A296728 A110875

Adjacent sequences: A302203 A302204 A302205 * A302207 A302208 A302209

Keyword

nonn

Author

R. H. Hardin, Apr 03 2018

Status

approved