A207723 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.

2, 16, 78, 441, 8575, 277729, 4799749, 93547584, 8978585264, 1701743731081, 92421758243781, 5198831216732241, 3314060538084914409, 4426079717506620317769, 675694617961142291654422

Offset

1,1

Comments

Diagonal of A207729.

Links

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

Example

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

Crossrefs

Cf. A207729.

Sequence in context: A028336 A244717 A208102 * A208835 A208683 A197992

Adjacent sequences: A207720 A207721 A207722 * A207724 A207725 A207726

Keyword

nonn

Author

R. H. Hardin, Feb 19 2012

Status

approved