A239985 Number of nX7 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

1, 8, 107, 4059, 131242, 4803152, 226886115, 9004871354, 404795616742, 19130966325023

Offset: 1

Author

R. H. Hardin, Mar 30 2014

Keywords

• nonn

Comments

Column 7 of A239986

Examples

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