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A207980
Number of n X 4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).
2
15, 1080, 587208, 953124784, 3410310590912, 22727131144960768, 253335104721267417984, 4382417290595586402531584, 111319355727036703898865465344, 3978834602846298450265688566196224, 193442461762324413798952526604793292800
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0
..1..1..2..1....2..1..2..1....1..1..2..1....1..2..1..0....1..1..1..1
..0..3..0..0....0..0..0..0....2..0..0..0....0..0..1..0....2..0..0..0
..4..1..1..1....1..1..1..1....1..1..1..2....2..2..1..0....1..1..1..1
CROSSREFS
Column 4 of A207981.
Sequence in context: A233509 A206162 A203409 * A131313 A208346 A236329
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
EXTENSIONS
Terms a(8) and beyond from Andrew Howroyd, Mar 15 2023
STATUS
approved