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A207980 Number of nX4 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) 0
15, 1080, 587208, 953124784, 3410310590912, 22727131144960768, 253335104721267417984 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A207981

LINKS

Table of n, a(n) for n=1..7.

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

Sequence in context: A233509 A206162 A203409 * A131313 A208346 A236329

Adjacent sequences:  A207977 A207978 A207979 * A207981 A207982 A207983

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2012

STATUS

approved

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Last modified October 28 13:15 EDT 2020. Contains 338055 sequences. (Running on oeis4.)