A206730 Number of nX4 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal

69, 4761, 219714, 9974630, 448162001, 20163037412, 908849973079, 40990717802193, 1849354196459415, 83440978574764563, 3764847005563217944, 169869177897704286957, 7664455626110144907091, 345817984389817044657122

Offset

1,1

Comments

Column 4 of A206734

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A207204 A207210 A206953 * A207354 A207985 A207197

Adjacent sequences: A206727 A206728 A206729 * A206731 A206732 A206733

Keyword

nonn

Author

R. H. Hardin Feb 11 2012

Status

approved