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A183361
One quarter the number of nX9 1..4 arrays with no two neighbors of any element equal to each other
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2011
STATUS
approved