A228384 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.

1, 2, 21, 382, 17578, 1755243, 402968942, 207573951234, 242284444195349, 638096588519781536, 3798652903378388363280, 51076133156779686951912785, 1551660182965034835583479000348, 106488245934766828340647881986248382

Offset

1,2

Comments

Diagonal of A228390

Links

R. H. Hardin, Table of n, a(n) for n = 1..30

Example

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

Crossrefs

Sequence in context: A177234 A099710 A098344 * A216281 A263625 A245686

Adjacent sequences: A228381 A228382 A228383 * A228385 A228386 A228387

Keyword

nonn

Author

R. H. Hardin Aug 21 2013

Status

approved