A239979 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

1, 3, 13, 171, 7113, 652346, 226886115, 198719581101

Offset: 1

Author

R. H. Hardin, Mar 30 2014

Keywords

• nonn

Comments

Diagonal of A239986

Examples

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