A195804 Number of triangular nXnXn 0..7 arrays with all rows and diagonals having the same length having the same sum, with corners zero

1, 1, 8, 512, 27412, 21779968, 479534519840

Offset

1,3

Comments

Column 7 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
.....1.1........4.0........1.1........2.5........3.0........3.0........6.3
....0.1.2......0.1.2......0.1.2......7.1.2......5.1.6......5.1.6......1.1.2
...2.2.0.0....1.2.0.3....2.2.0.0....2.0.5.4....0.3.2.2....0.3.2.2....3.3.2.5
..0.0.1.2.0..0.3.1.1.0..0.0.1.2.0..0.5.3.3.0..0.3.4.1.0..0.3.4.1.0..0.6.0.4.0

Crossrefs

Sequence in context: A241756 A236220 A128794 * A145259 A154025 A013713

Adjacent sequences: A195801 A195802 A195803 * A195805 A195806 A195807

Keyword

nonn

Author

R. H. Hardin Sep 23 2011

Status

approved