A207880 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 1 0 vertically

2, 16, 82, 575, 4387, 33631, 618202, 12501427, 214612008, 11062960730, 657453772615, 25402400315447, 3733312830860298, 643896610977129232, 54640540348513184649, 23181398334398528895458, 11714931649831496203623180

Offset

1,1

Comments

Diagonal of A207885

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Sequence in context: A053587 A052346 A207482 * A207263 A207757 A283951

Adjacent sequences: A207877 A207878 A207879 * A207881 A207882 A207883

Keyword

nonn

Author

R. H. Hardin Feb 21 2012

Status

approved