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A271241
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 different.
0
0, 0, 64, 19200, 9523200, 10151116800, 24976569139200, 147041646595276800, 2111181855372030771200, 74797974069666738339840000, 6589977222119386033348096819200
OFFSET
1,3
COMMENTS
Column 3 of A271246.
EXAMPLE
Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......0.1......1.1......1.2......1.0......1.1......0.1......0.1
...3.0.0....2.2.0....1.2.2....3.3.3....2.3.2....1.2.0....2.2.3....1.2.2
..0.0.1.2..0.0.0.1..2.3.3.0..3.2.3.2..2.2.3.0..3.2.1.3..2.2.3.3..1.2.0.3
CROSSREFS
Cf. A271246.
Sequence in context: A013781 A330482 A187407 * A283536 A089208 A083282
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2016
STATUS
approved