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A268027
Number of 3Xn 0..2 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.
1
24, 576, 13824, 295962, 6042732, 117582228, 2205234900, 40088968398, 709841497188, 12287419441812, 208546228493724, 3478737714576768, 57143989099923852, 925889151644801202, 14817867358400405148
OFFSET
1,1
COMMENTS
Row 3 of A268026.
FORMULA
Empirical recurrence of order 86 (see link above)
EXAMPLE
Some solutions for n=3
..1..2..1....1..2..0....0..0..2....1..1..2....2..0..0....2..1..1....0..2..2
..0..2..1....0..1..1....1..1..0....1..2..0....1..2..0....1..0..2....2..1..2
..2..0..2....2..2..1....1..1..2....0..0..1....1..1..1....1..0..1....2..1..1
CROSSREFS
Cf. A268026.
Sequence in context: A267962 A188870 A171298 * A009968 A041265 A042106
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 24 2016
STATUS
approved