n is divisible by the 4th power of the number of unitary divisors of n (A034444).

Terms

a(0) =1a(1) =16a(2) =32a(3) =64a(4) =128a(5) =256a(6) =512a(7) =768a(8) =1024a(9) =1280a(10) =1536a(11) =1792a(12) =2048a(13) =2304a(14) =2560a(15) =2816a(16) =3072a(17) =3328a(18) =3584a(19) =4096a(20) =4352a(21) =4608a(22) =4864a(23) =5120a(24) =5632a(25) =5888a(26) =6144a(27) =6400a(28) =6656a(29) =6912