Number of letters in n (in Spanish).

Terms

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