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A216660
Number of horizontal, vertical or knight-move neighbor colorings of an nX2 array with new integer colors introduced in row major order
0
1, 4, 25, 279, 4800, 116635, 3760019, 153831836, 7730921915, 465562795125, 32949873078160, 2698248029796465, 252407175864930849, 26685021081300144340
OFFSET
1,2
COMMENTS
Column 2 of A216663
EXAMPLE
Some solutions for n=3
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..2..3....2..3....2..0....1..2....1..0....2..0....2..3....2..0....2..3....2..3
..0..2....4..1....0..2....0..3....2..3....0..1....3..1....3..1....0..4....3..4
CROSSREFS
Sequence in context: A361589 A320569 A058791 * A352859 A374851 A350585
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 13 2012
STATUS
approved