Infinitary multi-perfect numbers.

Terms

a(0) =1a(1) =6a(2) =60a(3) =90a(4) =120a(5) =36720a(6) =73440a(7) =12646368a(8) =22276800a(9) =44553600a(10) =126463680a(11) =133660800a(12) =252927360a(13) =758782080a(14) =4201148160a(15) =8402296320a(16) =28770487200a(17) =287704872000a(18) =575409744000