A208390 Number of nX6 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.

122, 76806, 48890520, 31112194860, 19798894881900, 12599441934740388, 8017919094401985204, 5102370957264743298996, 3247000759052439181788564, 2066297024969543787823082196, 1314931443577477050291551747028

Offset: 1

Author

R. H. Hardin Feb 25 2012

Keywords

• nonn

Comments

Column 6 of A208392

Examples

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

Links

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

Formula

Empirical: a(n) = 649*a(n-1) -8088*a(n-2) +32724*a(n-3) -69156*a(n-4) +80352*a(n-5) -46656*a(n-6) for n>7