A271240 Number of nXnXn triangular 0..2 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.

0, 0, 27, 3969, 900963, 401227533, 378139318893, 781827640754454, 3616937252790336657, 37896435473683175186868, 906454150918706470312961064, 49772528444719473909687286111017, 6299004718478220148511987214265415811

Offset

1,3

Comments

Column 2 of A271246.

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.0......1.1......0.0......1.1......1.0......0.1......1.0......1.2
...0.2.1....1.2.1....0.0.1....1.0.1....2.2.2....1.2.2....2.0.0....2.2.0
..0.2.2.1..2.1.0.1..0.2.2.0..2.2.1.0..1.2.2.2..2.2.2.2..1.1.2.0..0.2.1.2

Crossrefs

Cf. A271246.

Sequence in context: A195374 A238698 A230169 * A223327 A211927 A298595

Adjacent sequences: A271237 A271238 A271239 * A271241 A271242 A271243

Keyword

nonn

Author

R. H. Hardin, Apr 02 2016

Status

approved