A207224 Number of nX4 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.

61, 3721, 100997, 3447649, 115679881, 3814387801, 125372637881, 4126073501121, 135963448993769, 4480839360430545, 147644379170646697, 4864581400227966369, 160280548163611896153, 5281079669610169252337, 174006141329285345485257

Offset

1,1

Comments

Column 4 of A207228

Links

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

Example

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

Crossrefs

Sequence in context: A375893 A269025 A207231 * A207011 A206975 A206969

Adjacent sequences: A207221 A207222 A207223 * A207225 A207226 A207227

Keyword

nonn

Author

R. H. Hardin, Feb 16 2012

Status

approved