A208413 Number of 6Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

187, 700075, 2646531062, 10084768380770, 38410047476679936, 146298576850884166522, 557229580446475130201608, 2122405243795588131572978866, 8083928267793741312454314127058

Offset: 1

Author

R. H. Hardin Feb 26 2012

Keywords

• nonn

Comments

Row 6 of A208408

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210