Number of letters in n (in Irish Gaelic).

Terms

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