A240155 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

4, 11, 20, 107, 186, 450, 1641, 2788, 8018, 23175, 45126, 134673, 357608, 737260, 2166386, 5505921, 11966760, 34560626, 85121623, 194751022, 548083132, 1325791556, 3156785846, 8660504920, 20790818391, 50929828270, 136560783094

Offset: 1

Author

R. H. Hardin, Apr 02 2014

Keywords

• nonn

Comments

Row 3 of A240153

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..184