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

A098607

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

Terms

    a(0) =0a(1) =1a(2) =34a(3) =988a(4) =30120a(5) =1002360a(6) =36667344a(7) =1471350720a(8) =64457424000

External references