[S(n)=sum(n=1)^(n)(n)/(1+n^(2)+n^(4))," ...

[S_(n)=sum_(n=1)^(n)(n)/(1+n^(2)+n^(4))," then "S_(10)S_(20)],[" 1) "(110)/(111),(211)/(421)quad " 2) "(110)/(421),(111)/(112)],[" 3) "(110)/(111)(420)/(421)quad " 4) "(55)/(111),(210)/(421)]

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