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A216693
Number of horizontal, vertical, diagonal or knight-move neighbor colorings of an nX4 array with new integer colors introduced in row major order
0
5, 90, 11730, 6901440, 11239872497
OFFSET
1,1
COMMENTS
Column 4 of A216694
EXAMPLE
Some solutions for n=2
..0..1..2..3....0..1..0..1....0..1..2..3....0..1..0..2....0..1..0..2
..4..5..6..0....2..3..4..5....4..5..4..5....3..4..3..4....2..3..4..3
CROSSREFS
Sequence in context: A295766 A361586 A367500 * A158073 A038636 A282052
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 14 2012
STATUS
approved