A233069 Number of nX4 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 in row major order.

14, 289, 6854, 164495, 3957778, 95264272, 2293174089, 55201144642, 1328800293991, 31986846738550, 769986578444547, 18535097820450198, 446176415304028392, 10740347610658418594, 258541381485766745236

Offset: 1

Author

R. H. Hardin, Dec 03 2013

Keywords

• nonn

Comments

Column 4 of A233073

Examples

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

Links

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

Formula

Empirical: a(n) = 30*a(n-1) -155*a(n-2) +312*a(n-3) -393*a(n-4) +247*a(n-5) +43*a(n-6) -112*a(n-7) +15*a(n-8) +22*a(n-9) -9*a(n-10) +a(n-11) for n>12