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)

5, 602, 373780, 656404264, 2475181138384, 17131843186425504, 196551307092757144384, 3478554309451804194287232, 90015726535715347904300537088, 3267494997828691666636390741293568

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