A207803 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 0 1 vertically.

2, 16, 102, 1970, 57184, 3511534, 388134978, 82999241712, 33304563708790, 25409866877400042, 36648009080479725120, 100161609586888545878490, 518205987191621802807914102, 5077481011895003740693688753360

Offset

1,1

Comments

Diagonal of A207808.

Links

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

Example

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

Crossrefs

Cf. A207808.

Sequence in context: A207945 A207853 A208022 * A370823 A059204 A187248

Adjacent sequences: A207800 A207801 A207802 * A207804 A207805 A207806

Keyword

nonn

Author

R. H. Hardin, Feb 20 2012

Status

approved