A206832 Number of n X n 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

4, 256, 205518, 2152805235, 289315497297232, 503617001775793994676

Offset

1,1

Comments

Diagonal of A206838

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A207051 A207128 A223579 * A206894 A207284 A229100

Adjacent sequences: A206829 A206830 A206831 * A206833 A206834 A206835

Keyword

nonn

Author

R. H. Hardin Feb 13 2012

Status

approved