A207577 Number of nX3 0..3 arrays avoiding the pattern z+1 z+1 z horizontally and z-1 z-1 z vertically

61, 3721, 196916, 10346480, 542989615, 28493353430, 1495251731248, 78467042510200, 4117726119697653, 216086359269508078, 11339580231820687861, 595067969843345032215, 31227424258112334289354, 1638723765498248302307308

Offset

1,1

Comments

Column 3 of A207582

Links

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

Example

Some solutions for n=4
..1..1..1....3..1..1....2..0..3....0..0..3....2..0..1....0..1..1....1..0..2
..3..2..3....1..3..3....0..2..0....0..1..1....0..2..0....3..3..0....3..2..1
..3..0..0....3..1..3....3..1..1....2..0..2....1..2..1....3..1..1....1..0..3
..2..1..3....1..3..3....2..0..2....2..1..0....3..0..0....3..2..1....3..0..1

Crossrefs

Sequence in context: A206792 A206962 A206572 * A209087 A207052 A207129

Adjacent sequences: A207574 A207575 A207576 * A207578 A207579 A207580

Keyword

nonn

Author

R. H. Hardin Feb 19 2012

Status

approved