A239821 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4.

11, 113, 1480, 18728, 232272, 2912793, 36627126, 459870638, 5774508494, 72538478424, 911227478673, 11446501405086, 143789611879946, 1806288798172920, 22690641341877163, 285040443527806965

Offset: 1

Author

R. H. Hardin, Mar 27 2014

Keywords

• nonn

Comments

Row 3 of A239819

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 64

Formula

Empirical recurrence of order 64 (see link above)