A207204 Number of nX4 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

69, 4761, 192640, 7766709, 309262926, 12412097426, 500670359576, 20211739475415, 816401994553473, 32972023758335404, 1331635905868048301, 53778704755332004072, 2171870069814018679084, 87711499374615432079880

Offset

1,1

Comments

Column 4 of A207208

Links

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

Example

Some solutions for n=5
..0..2..2..0....1..0..2..0....2..0..1..2....2..2..1..2....1..2..2..1
..0..1..0..1....1..0..0..0....0..2..1..0....2..2..1..0....2..0..1..1
..2..2..2..2....0..2..0..0....2..1..0..1....0..1..0..1....2..1..1..0
..1..2..2..2....2..0..0..0....0..2..1..2....0..2..0..0....1..0..0..2
..1..2..1..1....2..0..0..2....0..0..2..0....2..2..0..0....1..2..0..2

Crossrefs

Sequence in context: A252998 A202978 A206859 * A207210 A206953 A206730

Adjacent sequences: A207201 A207202 A207203 * A207205 A207206 A207207

Keyword

nonn

Author

R. H. Hardin Feb 15 2012

Status

approved