A271338 Number of nXnXn triangular 0..6 arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal.

0, 1, 36, 19788, 201709343, 26246080066323, 26082639397246675725, 173162355470048137511631249

Offset

1,3

Comments

Column 6 of A271339.

Links

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

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....0.0......1.2......0.0......1.2......1.0......0.1......0.0......1.0
...1.2.0....1.1.3....1.1.1....3.1.1....1.1.1....1.2.3....1.2.2....1.0.0
..3.0.0.3..4.0.0.2..2.0.0.2..1.1.1.3..2.2.3.4..2.2.3.3..3.0.3.4..0.0.1.1

Crossrefs

Cf. A271339.

Sequence in context: A196885 A271337 A203329 * A001308 A067584 A308423

Adjacent sequences: A271335 A271336 A271337 * A271339 A271340 A271341

Keyword

nonn

Author

R. H. Hardin, Apr 04 2016

Status

approved