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

Author

R. H. Hardin Feb 25 2012

Keywords

• nonn

Comments

Row 2 of A208301

Examples

			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
		

Links

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