A271402 Number of nXnXn triangular 0..3 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all equal.

0, 0, 15, 7308, 12228624, 64737526428, 1154220690521736, 71883280458399045024, 15961768017547382691305580, 12797794574827131970767093610608, 37360444188237067201116806170118345988

Offset

1,3

Comments

Column 3 of A271407.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......1.2......1.2......1.0......1.0......0.1......1.1......1.1
...2.2.0....3.0.0....0.3.3....2.2.2....2.2.1....2.2.3....2.1.0....2.2.2
..0.2.3.1..2.3.0.3..3.0.3.2..1.1.2.2..0.2.3.0..1.2.0.1..0.2.1.3..2.1.2.3

Crossrefs

Cf. A271407.

Sequence in context: A113795 A205155 A208095 * A205304 A334835 A206295

Adjacent sequences: A271399 A271400 A271401 * A271403 A271404 A271405

Keyword

nonn

Author

R. H. Hardin, Apr 06 2016

Status

approved