A240415 Number of 4Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.

25, 139, 1526, 11670, 74655, 773196, 5429095, 41264901, 368615027, 2585037182, 21489185687, 174817614437, 1291058701632, 10769864002354, 83962833112352, 648485033420957, 5301967970926934, 40960040109260355, 323977574986307633

Offset: 1

Author

R. H. Hardin, Apr 04 2014

Keywords

• nonn

Comments

Row 4 of A240412

Examples

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

Links

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