A232379 Number of 4Xn 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, diagonally or antidiagonally, and no adjacent values equal.

1, 230, 4550, 63744, 927706, 14326374, 219597458, 3342549408, 50948669958, 777136688838, 11852126079904, 180743308881776, 2756349347909628, 42034903671321438, 641040165008121734, 9775973027252581380

Offset: 1

Author

R. H. Hardin, Nov 23 2013

Keywords

• nonn

Comments

Row 4 of A232376

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 60

Formula

Empirical recurrence of order 60 (see link above)