A208302 Number of 2Xn 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, 5, 42, 602, 12840, 373780, 14050312, 656404264, 37060650272, 2475181138384, 192262536609952, 17131843186425504, 1731360533569170048, 196551307092757144384, 24860319276726031245440, 3478554309451804194287232

Offset

1,1

Comments

Row 2 of A208301

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

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
..2..3..4..2....2..1..2..0....2..1..0..3....0..1..0..1....0..1..0..2

Crossrefs

Sequence in context: A075872 A075891 A246669 * A273398 A116297 A215170

Adjacent sequences: A208299 A208300 A208301 * A208303 A208304 A208305

Keyword

nonn

Author

R. H. Hardin Feb 25 2012

Status

approved