A239994 Number of n X n 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 or one plus the sum of the elements diagonally to its northwest, modulo 4.

2, 13, 190, 6527, 635873, 191691132, 182333502325

Offset: 1

Author

R. H. Hardin, Mar 30 2014

Keywords

• nonn
• changed

Comments

Diagonal of A240000.

Examples

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

Crossrefs

Cf. A240000.