A200152 Number of 0..6 arrays x(0..n-1) of n elements with zero n-1st difference.

1, 7, 25, 107, 381, 1589, 5153, 18809, 68813, 256859, 883247, 4997167, 12448095, 76804553, 181129817, 522024177, 1884097881, 16163873397, 38888615377, 239811969005

Offset: 1

Author

R. H. Hardin Nov 13 2011

Keywords

• nonn

Comments

Column 6 of A200154

Examples

			Some solutions for n=6
..1....1....6....5....5....3....5....0....0....0....6....2....0....4....2....5
..6....4....6....4....1....4....6....0....6....2....6....6....2....4....2....2
..2....2....5....4....2....0....3....2....3....3....4....6....0....4....2....2
..0....2....3....4....3....1....2....2....2....3....2....6....2....3....4....1
..3....4....2....4....3....6....4....0....4....3....2....6....6....2....6....0
..6....1....6....5....5....3....5....0....0....5....6....2....0....4....2....5