A183361 One quarter the number of nX9 1..4 arrays with no two neighbors of any element equal to each other

8748, 589824, 314928, 435600, 802944, 1679616, 3852288, 9437184, 23003136, 47775744, 95551488, 191102976, 389283840, 807469056, 1695744000, 3588489216, 7596343296, 16057958400, 33888927744, 71430045696, 150473539584

Offset

1,1

Comments

Column 9 of A183362

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

Some solutions for 5X9 with a(1,1)=1
..1..1..2..3..3..1..2..3..4....1..1..2..4..4..2..2..3..1
..2..4..4..1..2..4..4..1..1....2..4..3..3..1..1..4..3..2
..2..3..3..1..2..3..3..2..2....2..4..1..2..2..3..4..1..2
..4..1..2..4..4..1..1..4..3....3..3..1..4..4..3..2..1..3
..3..1..2..3..3..2..2..4..1....4..2..2..3..1..1..2..4..4

Crossrefs

Sequence in context: A110077 A300566 A203377 * A269193 A269142 A269200

Adjacent sequences: A183358 A183359 A183360 * A183362 A183363 A183364

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved