A204077 Number of n X n 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1

0, 4, 132, 11236, 13346532, 94591923364, 4337212764978412, 1473512792354952891844

Offset

1,2

Comments

Diagonal of A204084

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=5
..3..0..0..0..1....3..0..0..0..1....1..1..0..1..2....1..0..2..0..0
..1..1..1..1..1....1..1..1..1..1....0..2..0..1..0....1..0..1..1..1
..0..2..1..1..0....0..3..3..0..0....0..0..3..2..0....0..3..3..1..2
..0..0..0..0..0....0..2..3..1..1....1..1..1..0..1....0..1..0..0..0
..1..1..3..1..1....1..1..0..0..1....3..0..0..0..1....2..1..0..1..1

Crossrefs

Sequence in context: A252172 A192837 A338040 * A194537 A194538 A194539

Adjacent sequences: A204074 A204075 A204076 * A204078 A204079 A204080

Keyword

nonn

Author

R. H. Hardin Jan 10 2012

Status

approved