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A208868
Number of nX4 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors
1
15, 1798, 307165, 52947540, 9130195864, 1574432811027, 271499374919883, 46818078167209471, 8073434644321782464, 1392204668383719239473, 240075497495975972163390, 41399261047580372916745574
OFFSET
1,1
COMMENTS
Column 4 of A208872
LINKS
FORMULA
Empirical: a(n) = 198*a(n-1) -4637*a(n-2) +40574*a(n-3) -164314*a(n-4) +321776*a(n-5) -281785*a(n-6) +85300*a(n-7) -8100*a(n-8) for n>9
EXAMPLE
Some solutions for n=4
..0..0..1..0....0..1..1..2....0..1..0..0....0..0..1..2....0..0..0..1
..1..2..2..0....0..2..0..0....2..2..1..2....1..3..3..0....1..1..2..0
..2..3..3..0....0..1..3..0....1..2..3..2....1..0..1..2....0..1..1..3
..1..2..3..2....1..2..2..0....0..3..0..0....1..2..0..0....3..0..3..1
CROSSREFS
Sequence in context: A122184 A069450 A205346 * A070862 A077730 A110103
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 02 2012
STATUS
approved