Number of ways to choose a factorization of each integer from 2 to n into factors > 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =4a(6) =4a(7) =12a(8) =24a(9) =48a(10) =48a(11) =192a(12) =192a(13) =384a(14) =768a(15) =3840a(16) =3840a(17) =15360a(18) =15360a(19) =61440a(20) =122880a(21) =245760a(22) =245760a(23) =1720320a(24) =3440640a(25) =6881280a(26) =20643840a(27) =82575360a(28) =82575360a(29) =412876800