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A216661
Number of horizontal, vertical or knight-move neighbor colorings of an nX3 array with new integer colors introduced in row major order
0
2, 25, 780, 59799, 8990804, 2315439963, 928319229295
OFFSET
1,1
COMMENTS
Column 3 of A216663
EXAMPLE
Some solutions for n=2
..0..1..0....0..1..0....0..1..2....0..1..2....0..1..0....0..1..2....0..1..2
..2..3..4....2..0..3....3..0..1....3..4..5....2..0..2....1..3..4....3..2..4
CROSSREFS
Sequence in context: A337153 A119829 A059363 * A301616 A298157 A342298
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 13 2012
STATUS
approved