A195799 Number of triangular nXnXn 0..2 arrays with all rows and diagonals having the same length having the same sum, with corners zero.

1, 1, 3, 27, 105, 1695, 284427, 11606931

Offset: 1

Author

R. H. Hardin Sep 23 2011

Keywords

• nonn

Comments

Column 2 of A195805

Examples

			Some solutions for n=5
......0..........0..........0..........0..........0..........0..........0
.....1.0........1.0........1.1........1.2........0.0........1.2........2.0
....1.0.1......2.0.2......2.2.2......0.1.0......2.0.2......0.1.0......1.1.1
...0.0.0.1....0.0.0.1....1.2.2.1....2.1.1.1....0.0.0.0....2.1.1.1....0.1.1.2
..0.1.1.0.0..0.1.2.0.0..0.1.2.1.0..0.1.0.2.0..0.0.2.0.0..0.1.0.2.0..0.2.1.0.0