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A215180 Number of nXnXn triangular 0..6 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
7, 16, 64, 445, 5096, 102958, 3332921, 183217251, 16238192913, 2328105483906, 511060202579902, 169341739247620227, 80428858087487593154, 54077603387869534941302, 49623033352634628707163403 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A215182

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..67

EXAMPLE

Some solutions for n=4

.....2........3........4........2........4........4........5........4

....2.2......2.4......2.6......2.2......2.6......4.4......5.5......3.5

...1.1.4....1.3.5....1.5.6....2.2.2....1.5.6....2.5.5....3.6.6....3.3.6

..0.0.4.4..0.3.3.6..0.5.5.6..0.0.2.6..0.4.6.6..0.4.6.6..2.6.6.6..0.4.6.6

CROSSREFS

Sequence in context: A318413 A183343 A318481 * A309476 A192376 A214904

Adjacent sequences:  A215177 A215178 A215179 * A215181 A215182 A215183

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2012

STATUS

approved

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Last modified September 27 01:55 EDT 2020. Contains 337379 sequences. (Running on oeis4.)