A271404 Number of nXnXn triangular 0..5 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all equal.

0, 0, 15, 11160, 101140812, 6623245236960, 2406648755770799076, 4780381645330995753547452, 52746524075859182651510400836592, 3272904219761041284771795930004451044056

Offset

1,3

Comments

Column 5 of A271407.

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....0.0......1.2......1.1......0.0......1.1......0.0......1.1......1.2
...1.0.2....2.2.1....2.1.2....1.0.2....1.1.1....1.1.2....1.1.0....2.2.3
..0.3.1.1..3.2.0.1..1.0.2.0..1.1.0.3..2.3.3.1..3.1.0.3..0.0.2.2..4.2.1.3

Crossrefs

Cf. A271407.

Sequence in context: A198911 A207867 A206513 * A271405 A271406 A208299

Adjacent sequences: A271401 A271402 A271403 * A271405 A271406 A271407

Keyword

nonn

Author

R. H. Hardin, Apr 06 2016

Status

approved