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A215180
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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
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1
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7, 16, 64, 445, 5096, 102958, 3332921, 183217251, 16238192913, 2328105483906, 511060202579902, 169341739247620227, 80428858087487593154, 54077603387869534941302, 49623033352634628707163403
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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........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
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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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