Number of letters in n (in Czech).

Terms

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