A271245 Number of nXnXn triangular 0..7 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.

0, 0, 77, 39237, 49235880, 209021374705, 3081891326050173, 151686712380427499712

Offset

1,3

Comments

Column 7 of A271246.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.1......0.0......1.2......1.2......0.0......1.2......1.2......1.2
...2.0.3....1.0.1....1.1.3....1.3.1....1.2.3....3.2.0....3.1.0....3.4.4
..0.4.0.4..2.0.2.3..4.2.2.4..4.1.3.5..3.2.4.4..2.2.4.3..4.2.0.1..1.4.2.0

Crossrefs

Cf. A271246.

Sequence in context: A267910 A271243 A271244 * A196543 A201983 A278370

Adjacent sequences: A271242 A271243 A271244 * A271246 A271247 A271248

Keyword

nonn

Author

R. H. Hardin, Apr 02 2016

Status

approved