Number of vowels in n (in French).

Terms

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