A271403 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 equal.

0, 0, 15, 10368, 50382432, 1107382932648, 105922911577754160, 45366137571771857371392, 88764335084725137561699861768, 803430619742909919221237883731275872

Offset

1,3

Comments

Column 4 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
....1.1......1.0......0.1......1.1......1.0......1.2......1.0......0.1
...1.1.0....2.3.3....0.2.2....2.1.3....1.1.1....1.1.3....2.0.0....2.2.3
..2.0.3.2..4.0.3.2..2.3.2.3..3.2.0.0..0.1.2.1..1.1.4.2..2.3.0.3..4.2.4.3

Crossrefs

Cf. A271407.

Sequence in context: A206593 A200794 A230173 * A198720 A140285 A208401

Adjacent sequences: A271400 A271401 A271402 * A271404 A271405 A271406

Keyword

nonn

Author

R. H. Hardin, Apr 06 2016

Status

approved