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A216758
Number of horizontal, vertical, diagonal, antidiagonal or knight-move neighbor colorings of an nX3 array with new integer colors introduced in row major order
0
2, 4, 60, 2957, 337731, 71786149, 24889021634, 12901134791995
OFFSET
1,1
COMMENTS
Column 3 of A216760
EXAMPLE
Some solutions for n=4
..0..1..0....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
..2..3..4....3..4..5....3..4..5....3..4..3....3..4..5....3..4..5....3..4..5
..5..1..6....6..1..7....0..6..2....2..5..2....2..1..6....2..6..2....6..7..2
..7..0..2....0..8..3....7..1..3....1..0..1....5..7..0....5..0..5....8..4..8
CROSSREFS
Sequence in context: A242737 A018348 A001625 * A018352 A121059 A139160
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 15 2012
STATUS
approved