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A208047
Number of nX5 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any horizontal, vertical or antidiagonal neighbor (colorings ignoring permutations of colors)
2
14, 128, 1356, 14976, 168096, 1897888, 21472544, 243113056, 2753187616, 31181409632, 353155643424, 3999817236576, 45301793546528, 513087070702432, 5811214258319904, 65817707844947552, 745450199930022688
OFFSET
1,1
COMMENTS
Column 5 of A208050
LINKS
FORMULA
Empirical: a(n) = 22*a(n-1) -177*a(n-2) +832*a(n-3) -2664*a(n-4) +5408*a(n-5) -4544*a(n-6) -7936*a(n-7) +24064*a(n-8) -16384*a(n-9) for n>10
EXAMPLE
Some solutions for n=4
..0..1..0..1..2....0..1..0..1..0....0..1..0..1..2....0..1..0..1..0
..2..3..2..3..0....2..3..2..3..2....3..2..3..0..3....2..3..2..3..1
..0..1..0..1..2....0..1..0..1..3....1..0..1..2..0....1..0..1..0..2
..3..2..3..0..3....2..3..2..0..1....2..3..0..1..2....2..3..2..1..0
CROSSREFS
Sequence in context: A173408 A166794 A229386 * A301379 A222571 A038841
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 22 2012
STATUS
approved