A207478 Number of nX7 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal

10686, 114190596, 415949940602, 1897778216001770, 8467264566580418754, 37628798991659309387420

Offset

1,1

Comments

Column 7 of A207479

Links

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

Example

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

Crossrefs

Sequence in context: A257428 A254237 A207282 * A207534 A238067 A184603

Adjacent sequences: A207475 A207476 A207477 * A207479 A207480 A207481

Keyword

nonn

Author

R. H. Hardin Feb 18 2012

Status

approved