A295646 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 1, 3 or 4 1's.

2, 11, 184, 8391, 1117226, 426233396, 468469936974, 1481365505094176, 13481259599060854448, 353057109477250625199058, 26608269052923054935486338857

Offset

1,1

Comments

Diagonal of A295652.

Links

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

Example

Some solutions for n=4
..0..1..0..1. .0..0..0..0. .0..0..1..0. .0..1..1..0. .0..1..0..1
..0..0..0..0. .0..0..1..0. .0..1..1..1. .0..0..0..0. .0..0..1..0
..0..1..1..0. .1..0..0..0. .0..0..1..0. .0..0..1..0. .1..0..0..0
..0..0..0..1. .1..0..0..0. .0..0..0..1. .0..1..0..0. .0..0..1..1

Crossrefs

Cf. A295652.

Sequence in context: A295246 A288564 A368561 * A124836 A365361 A013104

Adjacent sequences: A295643 A295644 A295645 * A295647 A295648 A295649

Keyword

nonn

Author

R. H. Hardin, Nov 25 2017

Status

approved