a(n) = the number of cubes (of integers > 0) that have bit length n.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =0a(6) =2a(7) =1a(8) =1a(9) =3a(10) =2a(11) =3a(12) =5a(13) =5a(14) =6a(15) =9a(16) =10a(17) =13a(18) =17a(19) =21a(20) =26a(21) =34a(22) =42a(23) =52a(24) =67a(25) =84a(26) =105a(27) =134a(28) =167a(29) =211