A207998 Number of nX2 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).

2, 15, 114, 1657, 36401, 1094076, 42436913, 2042803419, 118645071202, 8138047375093, 648222594284197, 59148486677131940, 6113429673418115581, 708972517372901061559, 91508202542991877872978, 13053785934982985242672065

Offset: 1

Author

R. H. Hardin, Feb 22 2012

Keywords

• nonn

Examples

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

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..100

Crossrefs

Column 2 of A208001.

Extensions

Terms a(16) and beyond from Andrew Howroyd, Jul 01 2017