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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 1
6, 12, 38, 192, 1558, 18940, 364970, 10283548, 429504540, 25437005278, 2101856931492, 235596818865156, 35497898136868548, 7006717056754996580, 1795137645392400993718, 583598433809166736549828 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 28 09:09 EDT 2022. Contains 354112 sequences. (Running on oeis4.)