A271193 Number of nXnXn triangular 0..7 arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all different.

0, 1, 72, 10794, 4427471, 5756884188, 25677012223896, 404846097287202139

Offset

1,3

Comments

Column 7 of A271194.

Links

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

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.0......1.1......0.1......1.0......1.1......0.1......0.1......1.1
...2.1.1....2.2.1....2.1.0....0.1.1....1.0.2....2.3.1....2.0.2....2.1.3
..0.3.1.4..0.3.2.2..2.1.0.2..2.2.3.3..1.1.1.2..4.2.2.1..0.0.3.3..1.0.0.0

Crossrefs

Cf. A271194.

Sequence in context: A271190 A271191 A271192 * A289369 A048544 A295599

Adjacent sequences: A271190 A271191 A271192 * A271194 A271195 A271196

Keyword

nonn

Author

R. H. Hardin, Apr 01 2016

Status

approved