A271242 Number of nXnXn triangular 0..4 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.

0, 0, 76, 33672, 28240419, 56147799704, 276127405321884, 3458900532989376102, 112196911041806546125391, 9529052847155132258919834684

Offset

1,3

Comments

Column 4 of A271246.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......1.0......1.2......1.0......0.1......1.2......1.1......1.2
...1.0.0....2.0.3....3.4.3....1.2.3....1.0.0....3.3.3....2.3.4....3.1.3
..3.0.4.0..1.3.0.4..3.4.3.4..2.1.2.4..2.2.1.1..4.1.0.4..4.2.1.4..2.4.3.1

Crossrefs

Cf. A271246.

Sequence in context: A028480 A229413 A111682 * A241878 A033521 A222739

Adjacent sequences: A271239 A271240 A271241 * A271243 A271244 A271245

Keyword

nonn

Author

R. H. Hardin, Apr 02 2016

Status

approved