A268006 Number of 3Xn 0..n arrays with every repeated value in every row and column equal to the previous repeated value, and new values introduced in row-major sequential order.

4, 122, 11051, 1880990, 555258347, 256785961187, 172734549522161, 159978813272172457, 195695804013150974073, 306159594755630395108860, 597115754061736885180703542

Offset

1,1

Comments

Row 3 of A268003.

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..0..0..1....0..0..1....0..0..1....0..1..2....0..1..0....0..1..1....0..1..2
..0..2..3....2..0..2....0..2..3....3..0..2....2..1..1....1..2..3....0..1..0
..2..0..1....3..2..2....3..0..3....2..1..3....0..0..3....1..1..0....0..0..0

Crossrefs

Cf. A268003.

Sequence in context: A364948 A080179 A268050 * A144993 A064681 A219871

Adjacent sequences: A268003 A268004 A268005 * A268007 A268008 A268009

Keyword

nonn

Author

R. H. Hardin, Jan 24 2016

Status

approved