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A215187
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Number of 7X7X7 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, 141, 1584, 36645, 364970, 3332921, 23336410, 143644981, 756744936, 3562883365, 15019874686, 58119516961, 206862317720, 687315946713, 2141261136428, 6308361172196, 17640556864702, 47119051969326, 120551657307564
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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............2.2............1.3............2.2............1.3
......2.2.2..........1.2.3..........1.2.3..........2.2.2..........0.3.3
.....0.1.3.4........1.1.3.3........0.2.3.3........1.1.3.3........0.1.3.4
....0.1.2.3.4......1.1.2.3.3......0.0.2.4.4......1.1.1.3.4......0.2.2.2.4
...0.1.1.2.4.4....1.1.2.2.2.4....0.1.2.2.3.4....0.0.0.4.4.4....0.0.2.3.3.4
..0.1.1.2.2.4.4..0.1.1.1.3.4.4..0.1.2.2.2.3.4..0.0.1.3.3.3.4..0.0.0.3.3.4.4
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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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