A200149 Number of 0..3 arrays x(0..n-1) of n elements with zero n-1st difference.

1, 4, 8, 22, 40, 112, 182, 688, 844, 2090, 2478, 21056, 20762, 112864, 113870, 204796, 141246, 2255872, 1610768, 18946704, 15066098, 20640826, 12378248, 332333696, 279217826, 531539936, 618937930, 1715570198, 330283576, 20131457680

Offset: 1

Author

R. H. Hardin Nov 13 2011

Keywords

• nonn

Comments

Column 3 of A200154

Examples

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