A207473 Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal

4, 256, 133556, 768149650, 45141978255552, 27133109124370438420

Offset

1,1

Comments

Diagonal of A207479

Links

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

Example

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

Crossrefs

Sequence in context: A326556 A223795 A207275 * A223658 A207529 A206968

Adjacent sequences: A207470 A207471 A207472 * A207474 A207475 A207476

Keyword

nonn

Author

R. H. Hardin Feb 18 2012

Status

approved