A265680 Number of 3Xn arrays containing n copies of 0..3-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0.

1, 4, 17, 75, 342, 1609, 7794, 38769, 197420, 1025860, 5422998, 29082855, 157846382, 865273950, 4782681972, 26619620697, 149029471080, 838498807438, 4737909767670, 26870622853674, 152888167033140, 872388499519974

Offset

1,2

Comments

Row 3 of A265679.

Links

R. H. Hardin, Table of n, a(n) for n = 1..117

Example

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

Crossrefs

Cf. A265679.

Sequence in context: A081568 A026378 A346740 * A255714 A151247 A290914

Adjacent sequences: A265677 A265678 A265679 * A265681 A265682 A265683

Keyword

nonn

Author

R. H. Hardin, Dec 13 2015

Status

approved