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A268420
Number of nX2 0..3 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.
1
2, 15, 187, 2530, 34195, 448667, 5720450, 71224847, 869969995, 10461568690, 124193817155, 1458609678443, 16976365857602, 196066210076847, 2249518678962747, 25662410911209090, 291308117338854611
OFFSET
1,1
COMMENTS
Column 2 of A268423.
LINKS
FORMULA
Empirical: a(n) = 33*a(n-1) -389*a(n-2) +1865*a(n-3) -2461*a(n-4) -3639*a(n-5) +7361*a(n-6) +2407*a(n-7) -5491*a(n-8) -585*a(n-9) +981*a(n-10) -81*a(n-11)
EXAMPLE
Some solutions for n=5
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..0....0..1....0..1
..0..2....1..0....2..3....2..0....2..0....1..2....2..1....1..2....2..2....2..0
..2..1....2..2....2..0....3..3....2..2....1..1....3..1....0..2....3..2....0..0
..1..2....2..2....3..0....3..3....0..0....2..2....2..1....3..1....1..0....1..3
..3..2....0..0....2..3....2..1....3..2....0..0....0..3....0..0....0..2....3..1
CROSSREFS
Cf. A268423.
Sequence in context: A052857 A053492 A319834 * A208402 A098343 A052819
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2016
STATUS
approved