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A208306
Number of 6 X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors).
2
1, 203, 678570, 46538017584, 17131843186425504, 21183598567292002167082, 67939294184937980415465539016, 479196921365748673300774676923278618, 6626004995909411145707148239379062019989108, 164986885310084515129040822858386474548745376110410
OFFSET
0,2
LINKS
EXAMPLE
Some solutions for n=4:
..0..1..2..0....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..0..1..2..0....0..1..0..1....2..1..0..1....0..1..0..1....2..1..0..1
..0..1..2..0....0..1..0..1....0..1..0..1....2..1..0..1....0..3..0..3
..0..1..2..0....2..1..3..0....2..1..2..0....0..1..2..0....0..1..0..1
..0..1..2..0....0..1..2..0....0..1..2..0....0..1..2..0....3..1..0..1
..0..1..2..3....0..1..2..0....0..3..1..0....0..1..2..0....0..1..0..1
CROSSREFS
Row 6 of A208301.
Sequence in context: A209525 A145635 A319783 * A208786 A208586 A208465
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 2012
EXTENSIONS
a(0)=1 prepended and terms a(6) and beyond from Andrew Howroyd, May 18 2020
STATUS
approved