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A185567 T(n,k)=1/4 the number of nXk 0..3 arrays with no element equal both to the element above and to the element to its left 8
1, 4, 4, 16, 60, 16, 64, 900, 900, 64, 256, 13500, 50580, 13500, 256, 1024, 202500, 2842560, 2842560, 202500, 1024, 4096, 3037500, 159749820, 598507920, 159749820, 3037500, 4096, 16384, 45562500, 8977824540, 126017211780, 126017211780 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

.....1.........4.............16..................64.....................256

.....4........60............900...............13500..................202500

....16.......900..........50580.............2842560...............159749820

....64.....13500........2842560...........598507920............126017211780

...256....202500......159749820........126017211780..........99407416968000

..1024...3037500.....8977824540......26533211918040.......78416544382742160

..4096..45562500...504547256880....5586628402633500....61858104930689319360

.16384.683437500.28355191537860.1176277376648694960.48796145962555619907720

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..220

EXAMPLE

Some solutions for 4X3 with a(1,1)=0

..0..2..2....0..0..2....0..0..2....0..0..0....0..0..2....0..0..2....0..0..0

..0..2..0....2..0..2....2..2..0....2..0..2....0..2..0....2..2..3....2..2..1

..1..0..3....1..3..0....3..3..2....1..1..3....2..0..2....3..2..3....3..3..0

..1..2..3....1..0..1....1..3..1....0..3..0....3..3..0....3..3..2....1..3..1

CROSSREFS

Column 2 is 4*A001024(n-1)

Sequence in context: A342817 A107382 A257622 * A203536 A038788 A010099

Adjacent sequences:  A185564 A185565 A185566 * A185568 A185569 A185570

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Jan 31 2011

STATUS

approved

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Last modified October 28 18:13 EDT 2021. Contains 348329 sequences. (Running on oeis4.)