Jordan function J_4(n).

Terms

a(0) =1a(1) =15a(2) =80a(3) =240a(4) =624a(5) =1200a(6) =2400a(7) =3840a(8) =6480a(9) =9360a(10) =14640a(11) =19200a(12) =28560a(13) =36000a(14) =49920a(15) =61440a(16) =83520a(17) =97200a(18) =130320a(19) =149760a(20) =192000a(21) =219600a(22) =279840a(23) =307200a(24) =390000a(25) =428400a(26) =524880a(27) =576000a(28) =707280a(29) =748800