Essentially same as A025148.

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =2a(10) =3a(11) =3a(12) =4a(13) =5a(14) =6a(15) =7a(16) =9a(17) =10a(18) =12a(19) =15a(20) =17a(21) =20a(22) =24a(23) =28a(24) =32a(25) =38