A200081 Number of 0..7 arrays x(0..n) of n+1 elements with zero n-1st differences.

1, 8, 22, 64, 182, 454, 1046, 2546, 5056, 11638, 33262, 101112, 191802, 688304, 769106, 1102184, 5220960, 23546744, 49886556, 135889790, 142614238, 121124812, 570957758

Offset: 1

Author

R. H. Hardin Nov 13 2011

Keywords

• nonn

Comments

Column 7 of A200082

Examples

			Some solutions for n=6
..2....7....7....2....6....0....0....2....1....1....5....2....0....6....7....6
..4....1....0....2....2....6....6....5....3....0....6....4....3....5....4....2
..3....3....3....1....0....7....6....6....5....1....5....2....4....4....6....3
..3....5....6....2....1....6....5....5....5....2....4....0....3....4....7....5
..5....4....5....5....4....5....5....3....3....2....4....0....1....5....5....6
..7....2....2....7....6....5....5....2....1....1....5....2....0....6....2....6
..4....6....5....2....2....6....1....5....3....0....6....4....3....5....4....7