First diagonal of A027447.

Terms

a(0) =1a(1) =1a(2) =4a(3) =9a(4) =144a(5) =100a(6) =3600a(7) =11025a(8) =78400a(9) =63504a(10) =6350400a(11) =5336100a(12) =768398400a(13) =662547600a(14) =577152576a(15) =2029052025a(16) =519437318400a(17) =463325262400