Square of LCM of {1, 2, ..., n}.

Terms

a(0) =1a(1) =4a(2) =36a(3) =144a(4) =3600a(5) =3600a(6) =176400a(7) =705600a(8) =6350400a(9) =6350400a(10) =768398400a(11) =768398400a(12) =129859329600a(13) =129859329600a(14) =129859329600a(15) =519437318400