A203535 Number of n X n 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1.

0, 4, 72, 3364, 1700580, 3743237124, 44312000955508, 2752746090434507556, 840982281825673724760300, 1273642755637661083775996170564

Offset

1,2

Comments

Diagonal of A203542.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=5
..0..1..2..0..1....1..1..0..0..0....2..1..0..0..2....0..0..1..0..1
..0..1..2..0..1....0..2..2..1..1....0..1..2..1..1....1..1..1..0..1
..2..1..2..0..2....0..2..1..0..1....0..1..1..2..0....1..0..1..0..0
..1..0..0..1..0....1..1..1..0..0....1..2..0..2..0....0..0..1..0..1
..1..0..1..1..0....1..0..0..1..1....1..0..0..1..1....2..1..1..0..1

Crossrefs

Cf. A203542.

Sequence in context: A327882 A003718 A012947 * A013066 A013102 A224900

Adjacent sequences: A203532 A203533 A203534 * A203536 A203537 A203538

Keyword

nonn

Author

R. H. Hardin, Jan 02 2012

Status

approved