Squarefree part of ((2n-1)!)^(2n-3).

Terms

a(0) =1a(1) =6a(2) =30a(3) =35a(4) =70a(5) =77a(6) =3003a(7) =1430a(8) =24310a(9) =230945a(10) =969969a(11) =4056234a(12) =676039a(13) =312018a(14) =1292646a(15) =33393355a(16) =2203961430a(17) =90751353a(18) =3357800061a(19) =1531628098a(20) =156991880045a(22) =105204948186a(23) =107492012277a(24) =35830670759