A166181 Number of nXnXn triangular nonnegative integer arrays with all sums of an element and its neighbors <= 9

1, 10, 220, 6111, 1264026, 771160264, 1124902818525

Offset

0,2

Links

Table of n, a(n) for n=0..6.

Example

Some solutions for n=4
.....1........2........0........1........0........5........1........6...
....3.0......2.2......1.2......1.2......2.0......1.0......2.0......0.0..
...1.0.1....2.0.1....3.2.0....0.0.0....0.2.1....1.0.3....1.1.0....0.0.0.
..1.0.1.0..4.0.0.0..3.0.1.0..7.1.1.0..5.0.1.0..0.0.1.0..1.0.0.0..0.1.0.1
------
.....2........1........0........0........0........0........4........1...
....2.1......4.0......1.1......0.0......0.1......1.0......2.0......0.2..
...3.0.2....0.1.3....2.0.2....2.0.0....2.1.3....0.5.1....2.0.0....0.0.3.
..1.1.0.0..4.0.0.0..5.1.1.0..5.1.0.0..0.1.0.0..2.1.0.0..3.0.1.0..9.0.0.0

Crossrefs

Sequence in context: A094420 A053131 A334908 * A199748 A210137 A064333

Adjacent sequences: A166178 A166179 A166180 * A166182 A166183 A166184

Keyword

nonn

Author

R. H. Hardin Oct 09 2009

Status

approved