A271188 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 different.

0, 1, 48, 3654, 546604, 173123868, 120268341210, 186894023900240, 657585270869505423, 5280815619326228961327, 97334193255656777198310662, 4134298293573473978291399679465, 405905093869786965065628534801801735

Offset

1,3

Comments

Column 2 of A271194.

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......1.2......0.0......0.1......1.2......1.2......0.1......0.1
...0.0.1....2.2.1....1.2.0....2.1.2....1.1.1....0.1.1....1.1.2....2.2.2
..1.1.2.1..2.0.0.1..2.2.1.1..2.1.2.0..2.1.1.1..0.1.1.2..0.1.0.1..2.1.0.2

Crossrefs

Cf. A271194.

Sequence in context: A203488 A162700 A027567 * A033475 A053060 A004034

Adjacent sequences: A271185 A271186 A271187 * A271189 A271190 A271191

Keyword

nonn

Author

R. H. Hardin, Apr 01 2016

Status

approved