A166176 Number of nXnXn triangular nonnegative integer arrays with all sums of an element and its neighbors <= 4

1, 5, 35, 232, 6052, 285850, 20417349, 3439249710, 1105607996796, 654788462119153, 783760670032822151

Offset

0,2

Links

Table of n, a(n) for n=0..10.

Example

Some solutions for n=4
.....1........4........0........0........0........2........0........1...
....0.0......0.0......2.0......0.3......0.1......0.1......1.0......1.0..
...0.0.1....0.0.0....1.0.0....1.0.0....2.0.0....1.0.1....0.0.2....1.0.1.
..2.0.0.3..1.2.1.0..1.0.1.3..3.0.0.1..1.0.1.1..3.0.0.0..3.0.0.1..2.0.1.0
------
.....2........0........1........1........2........0........1........1...
....0.1......1.1......0.0......3.0......0.0......1.1......3.0......1.0..
...0.0.0....0.0.0....2.1.0....0.0.0....0.0.0....1.0.0....0.0.0....1.0.0.
..1.0.0.2..2.1.1.0..0.0.0.2..0.0.0.0..2.0.0.3..2.0.0.1..1.0.0.1..2.0.1.0

Crossrefs

Sequence in context: A180250 A002074 A187444 * A154780 A007995 A374455

Adjacent sequences: A166173 A166174 A166175 * A166177 A166178 A166179

Keyword

nonn

Author

R. H. Hardin Oct 09 2009

Status

approved