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A265218
T(n,k)=Number of nXk 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal and vertical neighbors by a power of three.
7
1, 1, 1, 1, 0, 1, 4, 16, 16, 4, 12, 0, 114, 0, 12, 32, 1958, 17740, 17740, 1958, 32, 109, 0, 959210, 0, 959210, 0, 109, 366, 654833, 30623109, 361386063, 361386063, 30623109, 654833, 366, 1189, 0, 1704484254, 0, 112968132978, 0, 1704484254, 0, 1189, 9855
OFFSET
1,7
COMMENTS
Table starts
..1....1........1.........4.............12.............32...................109
..1....0.......16.........0...........1958..............0................654833
..1...16......114.....17740.........959210.......30623109............1704484254
..4....0....17740.........0......361386063..............0.........7949178726430
.12.1958...959210.361386063...112968132978.64809856589464.....84621589234807688
.32....0.30623109.........0.64809856589464..............0.830856356425163354553
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..9..6..9....0..9..8..5....0..3..2..5....0..3..2..1....0..9.10..1
..3..6..9.10....9..8..7..8....3..2..5..2....3..4..3..2....9..8..9.10
..4..7.10.11....8.11.10.11....4..3..2.11....2..1..2.11...10..7..8.11
CROSSREFS
Sequence in context: A147560 A266973 A029659 * A331055 A170836 A170875
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 05 2015
STATUS
approved