A239408 Number of 4Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4.

28, 698, 16449, 394509, 9340070, 222457036, 5277728354, 125489197292, 2979675864286, 70809806218933, 1681881988746468, 39960823740980549, 949269180927265463, 22552572727646416085, 535760871479260663596

Offset: 1

Author

R. H. Hardin, Mar 17 2014

Keywords

• nonn

Comments

Row 4 of A239405

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 91

Formula

Empirical recurrence of order 91 (see link above)