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A208307
Number of 7 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, 877, 27644437, 27700815674032, 196551307092757144384, 5737167377815628378510929822, 510275358863420934339418249390485008, 114130286115375064054502412158789812265958284, 56140177561453730943968268473396800731088097525712216
OFFSET
0,2
LINKS
EXAMPLE
Some solutions for n=4:
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..0..1..0..1....0..1..0..1....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....0..1..0..1
..2..1..0..1....0..1..0..1....0..1..2..0....0..1..0..1....0..1..0..1
..0..1..2..0....0..1..0..1....0..1..2..0....0..1..0..1....0..1..0..1
..0..1..2..1....2..1..0..1....0..1..2..0....0..1..0..1....0..2..0..1
..0..1..0..1....0..1..0..1....0..1..2..0....0..1..0..1....0..1..0..1
CROSSREFS
Row 7 of A208301.
Sequence in context: A188391 A209464 A209526 * A208787 A208587 A208472
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