Number of consonants in n (in German).

Terms

a(0) =3a(1) =2a(2) =2a(3) =2a(4) =2a(5) =3a(6) =4a(7) =3a(8) =3a(9) =2a(10) =3a(11) =2a(12) =4a(13) =5a(14) =5a(15) =6a(16) =6a(17) =5a(18) =6a(19) =5a(20) =5a(21) =8a(22) =9a(23) =9a(24) =9a(25) =10a(26) =11a(27) =10a(28) =10a(29) =9