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A208298 Number of nX4 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) 1
5, 602, 373780, 656404264, 2475181138384, 17131843186425504, 196551307092757144384, 3478554309451804194287232, 90015726535715347904300537088, 3267494997828691666636390741293568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A208301

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

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..2....0..1..0..1....0..1..0..1....2..1..0..1

..2..1..0..2....2..1..0..1....2..1..0..1....0..1..0..1....0..2..0..1

..0..1..0..1....0..1..0..2....0..1..0..1....2..3..0..1....0..1..0..1

CROSSREFS

Sequence in context: A302379 A303100 A302951 * A216077 A297949 A298558

Adjacent sequences:  A208295 A208296 A208297 * A208299 A208300 A208301

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

STATUS

approved

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Last modified December 7 07:57 EST 2021. Contains 349571 sequences. (Running on oeis4.)