A207051 Number of n X n 0..3 arrays avoiding the pattern z-1 z-1 z in any row or column

4, 256, 197144, 1980856064, 261322412243484, 453485461047011453843, 10355292626528629423108103805

Offset

1,1

Comments

Diagonal of A207057

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A206569 A207576 A209086 * A207128 A223579 A206832

Adjacent sequences: A207048 A207049 A207050 * A207052 A207053 A207054

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved