A215179 Number of nXnXn triangular 0..5 arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value

6, 12, 38, 192, 1558, 18940, 364970, 10283548, 429504540, 25437005278, 2101856931492, 235596818865156, 35497898136868548, 7006717056754996580, 1795137645392400993718, 583598433809166736549828

Offset

1,1

Comments

Column 5 of A215182

Links

R. H. Hardin, Table of n, a(n) for n = 1..85

Example

Some solutions for n=4
.....2........2........2........2........2........3........3........2
....1.3......1.3......1.3......2.2......1.3......2.4......3.3......2.2
...1.2.3....0.2.4....0.3.3....1.2.3....1.2.3....2.3.4....2.3.4....0.3.3
..1.1.3.3..0.0.3.5..0.2.3.3..0.2.3.3..0.0.3.5..0.2.5.5..0.3.4.5..0.0.4.4

Crossrefs

Sequence in context: A276601 A096377 A026083 * A128453 A185616 A307181

Adjacent sequences: A215176 A215177 A215178 * A215180 A215181 A215182

Keyword

nonn

Author

R. H. Hardin Aug 05 2012

Status

approved