a(n) is the first term k of A329902 for which A056239(k) = n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =24a(6) =40a(7) =60a(8) =84a(9) =168a(10) =336a(11) =528a(12) =792a(13) =936a(14) =1872a(15) =2448a(16) =3060a(17) =4560a(18) =4788a(19) =8280a(20) =15456a(21) =23184a(22) =29232a(23) =31248a(24) =62496a(25) =74592a(26) =124320a(27) =137760a(28) =144480a(29) =157920