A206968 Number of n X n 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

4, 256, 180294, 1391081032, 118749552817647

Offset

1,1

Comments

Diagonal of A206974

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A207473 A223658 A207529 * A206789 A206961 A206569

Adjacent sequences: A206965 A206966 A206967 * A206969 A206970 A206971

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved