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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)
4
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 25 2012
STATUS
approved