Highly composite numbers of class 4 (see comment in A275239).

Terms

a(0) =11a(1) =15a(2) =32a(3) =54a(4) =96a(5) =264a(6) =396a(7) =528a(8) =540a(9) =1560a(10) =2016a(11) =3120a(12) =4032a(13) =4200a(14) =8820a(15) =10560a(16) =10800a(17) =13440a(18) =16380a(19) =23760a(20) =37440a(21) =37800a(22) =71280a(23) =79200a(24) =87360a(25) =90720a(26) =128520a(27) =163800a(28) =257040a(29) =352800