Number of letters in the US English name of n, excluding spaces and hyphens.

Terms

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