A181213 Number of n X n binary matrices with no three 1's adjacent in a line diagonally or antidiagonally

2, 16, 400, 28561, 7133488, 5037592576, 11494250657760, 81903288018125025, 1774095560440527819780, 120560883729040740095954944, 25387802734116842287569948104640, 16523941893729018365186706701633818689

Offset

1,1

Comments

Diagonal of A181217

Links

R. H. Hardin, Table of n, a(n) for n=1..20

Example

Some avoided solutions for 4X4
..1..0..0..0....0..0..0..0....0..0..0..1....0..1..0..0....0..0..1..0
..0..1..0..0....0..0..1..1....0..1..1..0....0..0..1..0....0..1..0..0
..0..0..1..1....0..0..1..0....0..1..0..0....1..0..0..1....1..0..0..0
..0..0..0..0....0..1..0..0....0..0..0..0....0..0..0..0....0..0..1..0

Crossrefs

Sequence in context: A188904 A189104 A347914 * A283851 A130276 A027871

Adjacent sequences: A181210 A181211 A181212 * A181214 A181215 A181216

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved