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A368065
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a(n) = Product_{i=1..n, j=1..n} (i^2 + 5*i*j + j^2).
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5
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1, 7, 44100, 3210672937500, 12804360424787610000000000, 8591751256288909159255104643281750000000000, 2333034616280404811605303958158227652934766912996000000000000000000
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ c * 7^(7*n*(n+1)/2) * ((5-sqrt(21))/2)^(sqrt(21)*n*(n+1)/2) * n^(2*n^2 - 4/3) / exp(3*n^2), where c = A368069.
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MATHEMATICA
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Table[Product[i^2 + 5*i*j + j^2, {i, 1, n}, {j, 1, n}], {n, 0, 7}]
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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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