A271514 Number of nXnXn triangular 0..2 arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal and exactly one upright 2x2x2 triangle having values all different.

0, 0, 12, 1440, 207360, 46448640, 17836277760, 12328435187712, 15780397040271360, 38089369770346414080, 175515815901756276080640, 1557644360856119698123653120, 26796467468679998390760829353984

Offset

1,3

Comments

Column 2 of A271517.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.0......1.2......1.1......1.0......0.0......1.0......1.0......0.1
...0.0.0....2.2.2....1.1.0....2.0.0....0.1.1....1.1.1....1.1.2....1.2.1
..1.2.0.2..0.0.2.1..2.0.1.0..2.0.2.0..1.1.0.2..0.2.2.2..2.2.1.1..2.2.2.2

Crossrefs

Cf. A271517.

Sequence in context: A145835 A008992 A260448 * A181856 A161149 A160490

Adjacent sequences: A271511 A271512 A271513 * A271515 A271516 A271517

Keyword

nonn

Author

R. H. Hardin, Apr 09 2016

Status

approved