A195797 Number of triangular nXnXn 0..n arrays with all rows and diagonals having the same length having the same sum, with corners zero

1, 1, 4, 125, 5052, 5828215, 479534519840

Offset

1,3

Comments

Diagonal of A195805

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=5
......0..........0..........0..........0..........0..........0..........0
.....0.1........5.0........5.0........4.3........5.0........1.0........3.2
....4.4.3......5.0.5......3.0.5......4.0.3......3.0.4......3.1.3......5.1.5
...1.2.3.1....0.0.0.5....0.4.2.3....2.1.2.4....0.2.1.4....0.1.1.1....1.4.4.2
..0.0.5.0.0..0.5.5.0.0..0.5.1.2.0..0.5.2.3.0..0.5.2.1.0..0.1.3.0.0..0.4.2.3.0

Crossrefs

Sequence in context: A068891 A337245 A073351 * A354549 A286017 A068894

Adjacent sequences: A195794 A195795 A195796 * A195798 A195799 A195800

Keyword

nonn

Author

R. H. Hardin Sep 23 2011

Status

approved