A271032 Number of n X n X n triangular 0..6 arrays with some element less than a w, nw or ne neighbor exactly once.

0, 112, 5040, 188034, 6872424, 255757328, 9790184488, 386105784866, 15669594394610, 653037680536962, 27884254995169022, 1217213333853178756

Offset

1,2

Comments

Column 6 of A271034.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
.....0........0........1........1........1........1........1........0
....0.1......2.2......0.2......1.1......1.1......0.2......1.2......0.0
...1.4.5....2.3.4....0.2.2....2.2.5....3.5.5....2.2.2....1.2.2....0.0.4
..1.2.5.5..5.3.4.4..4.4.4.5..6.6.6.5..2.5.5.5..6.6.6.6..3.3.2.3..4.4.5.4

Crossrefs

Cf. A271034.

Sequence in context: A304552 A103860 A265660 * A213803 A291214 A035813

Adjacent sequences: A271029 A271030 A271031 * A271033 A271034 A271035

Keyword

nonn

Author

R. H. Hardin, Mar 29 2016

Status

approved