A271033 Number of nXnXn triangular 0..7 arrays with some element less than a w, nw or ne neighbor exactly once.

0, 168, 10164, 535106, 28658242, 1610555756, 95420380090, 5945425725202, 387907415514308, 26381892105883904

Offset

1,2

Comments

Column 7 of A271034.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
....0......4......1......3......0......5......1......1......1......2......0
...0.4....0.4....4.1....4.4....0.0....2.6....0.2....1.2....4.3....0.3....0.1
..0.0.6..0.4.6..5.6.6..7.4.7..6.2.3..2.6.6..0.7.7..3.2.6..5.5.7..1.5.5..5.1.4

Crossrefs

Cf. A271034.

Sequence in context: A003800 A278010 A006363 * A019286 A218413 A064767

Adjacent sequences: A271030 A271031 A271032 * A271034 A271035 A271036

Keyword

nonn

Author

R. H. Hardin, Mar 29 2016

Status

approved