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Search: id:A099866
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| A099866 |
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Denominator of sum of all elements M(i,j,k) = i*j/k, (i,j,k = 1..n). a(n) = Denominator[Sum[Sum[Sum[i*j/k,{i,1,n}],{j,1,n}],{k,1,n}]]. |
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| 1, 2, 1, 3, 4, 20, 5, 35, 56, 504, 70, 770, 3960, 1144, 1001, 45045, 80080, 1361360, 204204, 184756, 67184, 470288, 323323, 7436429, 27457584, 228813200, 106234700, 2868336900, 356948592, 10351509168, 145568097675, 45581929575, 85801279200
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