A271072 Number of nXnXn triangular 0..4 arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal.

0, 1, 35, 18378, 71196476, 1251600190741, 95988631214140725, 32691929496333266602180, 50116766403772597190744948180

Offset

1,3

Comments

Column 4 of A271075.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......0.1......0.0......0.0......1.2......1.1......0.0......1.2
...3.1.2....2.3.2....1.2.3....1.1.2....0.3.0....2.1.2....1.2.3....2.0.1
..4.1.2.2..1.0.2.2..4.4.4.2..0.0.0.0..0.4.0.0..1.2.2.3..1.4.2.3..2.0.1.1

Crossrefs

Cf. A271075.

Sequence in context: A345675 A007102 A196542 * A215570 A271073 A271074

Adjacent sequences: A271069 A271070 A271071 * A271073 A271074 A271075

Keyword

nonn

Author

R. H. Hardin, Mar 29 2016

Status

approved