A200150 Number of 0..4 arrays x(0..n-1) of n elements with zero n-1st difference.

1, 5, 13, 41, 103, 275, 685, 2525, 5221, 13897, 32717, 176145, 321963, 1390895, 2223445, 3845743, 10539177, 76756525, 147653093, 808935605, 934179307

Offset: 1

Author

R. H. Hardin Nov 13 2011

Keywords

• nonn

Comments

Column 4 of A200154

Examples

			Some solutions for n=6
..1....1....4....1....2....1....2....4....2....1....1....0....2....1....4....3
..2....0....1....1....1....2....1....0....1....4....1....2....3....4....1....2
..2....2....2....4....3....3....1....2....1....1....3....1....4....3....1....3
..2....4....2....4....3....4....1....4....2....0....4....1....3....2....2....2
..2....4....1....1....1....4....1....4....3....2....3....2....1....2....3....0
..1....1....4....1....2....1....2....4....2....1....1....0....2....1....4....3