a(n) is the number of numbers whose largest prime power factor equals A000961(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =12a(6) =8a(7) =16a(8) =48a(9) =96a(10) =48a(11) =240a(12) =480a(13) =960a(14) =960a(15) =960a(16) =3840a(17) =7680a(18) =3072a(19) =18432a(20) =36864a(21) =73728a(22) =147456a(23) =147456a(24) =442368a(25) =884736a(26) =1769472a(27) =589824a(28) =4128768a(29) =8257536