A302375 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 76, 4640, 1089035, 849467774, 2195619257236, 18920034863521166, 543629426918828295527

Offset

1,2

Comments

Diagonal of A302381.

Links

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

Example

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

Crossrefs

Cf. A302381.

Sequence in context: A141103 A300386 A054747 * A232030 A054950 A335722

Adjacent sequences: A302372 A302373 A302374 * A302376 A302377 A302378

Keyword

nonn

Author

R. H. Hardin, Apr 06 2018

Status

approved