Sum of all matrix elements M(i,j) = (i^2)/(i+j) multiplied by (2*n)!/n!.

A098612

Sum of all matrix elements M(i,j) = (i^2)/(i+j) multiplied by (2*n)!/n!.

Terms

    a(0) =0a(1) =1a(2) =38a(3) =1172a(4) =37080a(5) =1265640a(6) =47157936a(7) =1918916160a(8) =84991075200

External references