A240324 Number of nX4 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

6, 37, 455, 3374, 21455, 189549, 1190246, 8903613, 70945972, 460466581, 3565876476, 26437586127, 180411185989, 1394924206374, 9999389423346, 71022206087648, 538759260350717, 3826996325512698, 27847080935840982

Offset: 1

Author

R. H. Hardin, Apr 03 2014

Keywords

• nonn

Comments

Column 4 of A240327

Examples

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

Links

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