A204080 Number of nX4 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1

0, 16, 256, 11236, 107584, 3904576, 76212900, 1650959424, 39031534096, 864587548224, 19412272036096, 437675604807204, 9849402103175716, 221594251463336196, 4988444738917091904, 112294697209531469824

Offset

1,2

Comments

Column 4 of A204084

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A144318 A230142 A247165 * A223433 A223593 A067223

Adjacent sequences: A204077 A204078 A204079 * A204081 A204082 A204083

Keyword

nonn

Author

R. H. Hardin Jan 10 2012

Status

approved