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

1,2

Comments

Column 3 of A200154

Links

Table of n, a(n) for n=1..30.

Example

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

Crossrefs

Sequence in context: A050482 A323584 A332199 * A153765 A003606 A048657

Adjacent sequences: A200146 A200147 A200148 * A200150 A200151 A200152

Keyword

nonn

Author

R. H. Hardin, Nov 13 2011

Status

approved