A233729 Number of (n+1)X(4+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 6 and no adjacent elements equal.

2104, 21432, 233432, 2723072, 32240288, 389230764, 4696134192, 57174669348, 693181060760, 8455863542400, 102666251086924, 1252787231370072, 15219081421614496, 185695021438104644, 2256549296014445884

Offset: 1

Author

R. H. Hardin, Dec 15 2013

Keywords

• nonn

Comments

Column 4 of A233733

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 84

Formula

Empirical recurrence of order 84 (see link above)