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A215186
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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
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1
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2, 48, 328, 3216, 18940, 102958, 437416, 1745476, 6074164, 19546414, 57274236, 158706286, 408770608, 1005752468, 2347176012, 5262852883, 11312035800, 23548549548, 47322841540, 92544936670, 175876801036, 326378292388
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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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
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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