A207062 Number of n X n 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.

2, 16, 102, 720, 6398, 54684, 468348, 4356936, 41716708, 403445900, 4037337213, 41571957024, 435311467198, 4653843868560, 50835606848268, 564791240516000, 6378296516533122, 73247208566761530, 853936849893078000

Offset

1,1

Comments

Diagonal of A207068

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

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

Crossrefs

Sequence in context: A032260 A197800 A209645 * A207398 A207699 A207902

Adjacent sequences: A207059 A207060 A207061 * A207063 A207064 A207065

Keyword

nonn

Author

R. H. Hardin, Feb 14 2012

Status

approved