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A215186 Number of 6X6X6 triangular 0..n 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
2, 48, 328, 3216, 18940, 102958, 437416, 1745476, 6074164, 19546414, 57274236, 158706286, 408770608, 1005752468, 2347176012, 5262852883, 11312035800, 23548549548, 47322841540, 92544936670, 175876801036, 326378292388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 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............2

......2.2..........1.3..........1.3..........2.2..........1.3..........2.2

.....1.2.3........1.2.3........1.2.3........0.2.4........1.2.3........1.2.3

....1.1.3.3......1.2.2.3......0.2.2.4......0.2.2.4......0.2.3.3......0.2.2.4

...1.1.2.2.4....1.1.2.3.3....0.1.2.3.4....0.1.1.4.4....0.2.2.3.3....0.2.2.2.4

..0.1.2.2.3.4..0.1.2.3.3.3..0.0.1.3.4.4..0.2.2.2.2.4..0.2.2.2.2.4..0.1.1.3.3.4

CROSSREFS

Sequence in context: A226396 A075690 A101362 * A058090 A051252 A231654

Adjacent sequences:  A215183 A215184 A215185 * A215187 A215188 A215189

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2012

STATUS

approved

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Last modified August 5 22:11 EDT 2020. Contains 336214 sequences. (Running on oeis4.)