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A216630
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Number of nondecreasing arrays of n 0..n-1 integers with the sum of their 2nd powers equal to sum(i^2,i=0..n-1)
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1
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1, 1, 1, 1, 2, 4, 14, 37, 105, 309, 939, 2903, 8865, 28163, 90648, 297615, 989077, 3320885, 11280835, 38583017, 133018026, 461630411, 1612842357, 5667628973, 20019876401, 71078302590, 253504107762, 908014000543, 3265037780657
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OFFSET
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1,5
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COMMENTS
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LINKS
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EXAMPLE
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All solutions for n=6
..0....0....1....2
..1....0....2....2
..2....1....3....2
..3....2....3....3
..4....5....4....3
..5....5....4....5
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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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