A207227 Number of nX7 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.

1121, 1256641, 312522517, 125372637881, 47644493869633, 17182219699443153, 6152504033864688529, 2210806175420208130713, 798188687605046033604289, 288544627150883247074217513, 104252111969644072548865787265

Offset

1,1

Comments

Column 7 of A207228

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

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

Crossrefs

Sequence in context: A225995 A122052 A207234 * A207014 A203189 A317962

Adjacent sequences: A207224 A207225 A207226 * A207228 A207229 A207230

Keyword

nonn

Author

R. H. Hardin, Feb 16 2012

Status

approved