a(n) = A278243(n^2).

Terms

a(0) =1a(1) =2a(2) =2a(3) =60a(4) =2a(5) =2520a(6) =60a(7) =138600a(8) =2a(9) =87318000a(10) =2520a(11) =189189000a(12) =60a(14) =138600a(15) =70756686000a(16) =2a(18) =87318000a(20) =2520a(22) =189189000a(24) =60a(28) =138600