Number of letters in n (in Danish).

Terms

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