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

1,3

Comments

Column 2 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
.....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

Crossrefs

Sequence in context: A302525 A303407 A173491 * A297662 A127210 A161807

Adjacent sequences: A195796 A195797 A195798 * A195800 A195801 A195802

Keyword

nonn

Author

R. H. Hardin Sep 23 2011

Status

approved