A207999 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).

5, 114, 4141, 426422, 86545486, 29169661126, 14823734802701, 10648697150313375, 10321527909363771779, 13032394645031912097587, 20852865726433378283251197, 41354508341339617041441302471, 99804566252370862012176094395266, 288659258928461717629676421776606809

Offset: 1

Author

R. H. Hardin, Feb 22 2012

Keywords

• nonn

Examples

			Some solutions for n=4
..0..0..0....0..1..0....0..0..0....0..0..0....0..0..0....0..1..2....0..0..0
..1..0..1....1..0..1....1..2..1....1..0..1....1..0..1....0..0..1....1..0..1
..2..1..2....0..1..2....2..1..2....2..1..2....2..2..2....0..1..2....2..1..2
..1..2..1....1..2..1....3..0..0....1..0..3....1..0..1....1..2..1....1..0..1
		

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..50

Crossrefs

Column 3 of A208001.

Extensions

Terms a(8) and beyond from Andrew Howroyd, Jul 01 2017