Jordan-Polya numbers: products of factorial numbers A000142.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =8a(5) =12a(6) =16a(7) =24a(8) =32a(9) =36a(10) =48a(11) =64a(12) =72a(13) =96a(14) =120a(15) =128a(16) =144a(17) =192a(18) =216a(19) =240a(20) =256a(21) =288a(22) =384a(23) =432a(24) =480a(25) =512a(26) =576a(27) =720a(28) =768a(29) =864