A208387 Number of nX3 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

5, 117, 3042, 79092, 2056392, 53466192, 1390120992, 36143145792, 939721790592, 24432766555392, 635251930440192, 16516550191444992, 429430304977569792, 11165187929416814592, 290294886164837179392, 7547667040285766664192

Offset: 1

Author

R. H. Hardin Feb 25 2012

Keywords

• nonn

Comments

Column 3 of A208392

Examples

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

Links

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

Formula

Empirical: a(n) = 26*a(n-1) for n>2