A207275 Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal

4, 256, 121014, 553738958, 23419301672964

Offset

1,1

Comments

Diagonal of A207283

Links

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

Example

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

Crossrefs

Sequence in context: A122249 A326556 A223795 * A207473 A223658 A207529

Adjacent sequences: A207272 A207273 A207274 * A207276 A207277 A207278

Keyword

nonn

Author

R. H. Hardin Feb 16 2012

Status

approved