A206894 Number of n X n 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal

4, 256, 211548, 2408811358, 369048436354154, 768965608329861602588, 21727183867324671091396681434

Offset

1,1

Comments

Diagonal of A206900

Links

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

Example

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

Crossrefs

Sequence in context: A207128 A223579 A206832 * A207284 A229100 A060757

Adjacent sequences: A206891 A206892 A206893 * A206895 A206896 A206897

Keyword

nonn

Author

R. H. Hardin Feb 13 2012

Status

approved