The lower left triangle of the ED2 array A167560.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =16a(5) =32a(6) =24a(7) =80a(8) =192a(9) =384a(10) =120a(11) =480a(12) =1344a(13) =3072a(14) =6144a(15) =720a(16) =3360a(17) =10752a(18) =27648a(19) =61440a(20) =122880a(21) =5040a(22) =26880a(23) =96768a(24) =276480a(25) =675840a(26) =1474560a(27) =2949120a(28) =40320a(29) =241920