A271405 Number of nXnXn triangular 0..6 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all equal.

0, 0, 15, 11244, 133557336, 19403620120548, 21047213682560996208, 149800609621920261292052832, 6977143669666797212087528454453012, 2148748829446463101953971811931782270725784

Offset

1,3

Comments

Column 6 of A271407.

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......0.1......1.1......1.1......1.2......1.1......1.2......1.0
...1.2.2....2.2.1....0.1.0....0.0.2....3.3.3....0.1.0....1.0.0....0.2.2
..3.1.2.1..3.2.1.2..1.2.1.0..2.0.2.3..3.2.3.4..2.3.1.0..3.0.0.2..0.2.2.1

Crossrefs

Cf. A271407.

Sequence in context: A207867 A206513 A271404 * A271406 A208299 A282945

Adjacent sequences: A271402 A271403 A271404 * A271406 A271407 A271408

Keyword

nonn

Author

R. H. Hardin, Apr 06 2016

Status

approved