Floor of Pi^(2*n)/Zeta(2*n).

Terms

a(0) =6a(1) =90a(2) =945a(3) =9450a(4) =93555a(5) =924041a(6) =9121612a(7) =90030844a(8) =888579011a(9) =8769948429a(10) =86555983552a(11) =854273468992