A195800 Number of triangular nXnXn 0..3 arrays with all rows and diagonals having the same length having the same sum, with corners zero

1, 1, 4, 64, 496, 24928, 17528896, 3850960912

Offset

1,3

Comments

Column 3 of A195805

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=5
......0..........0..........0..........0..........0..........0..........0
.....3.3........1.0........2.0........2.2........1.0........0.1........2.0
....0.3.0......1.1.3......3.0.3......1.0.1......1.1.1......0.2.0......3.0.3
...3.3.3.3....1.2.0.0....0.0.0.2....2.0.0.2....0.1.1.1....1.2.2.0....0.0.0.2
..0.3.0.3.0..0.0.2.1.0..0.2.3.0.0..0.2.1.2.0..0.1.1.0.0..0.0.0.1.0..0.2.3.0.0

Crossrefs

Sequence in context: A103751 A053959 A343725 * A224446 A128782 A353453

Adjacent sequences: A195797 A195798 A195799 * A195801 A195802 A195803

Keyword

nonn

Author

R. H. Hardin Sep 23 2011

Status

approved