Number of consonants in the American English name of n.

Terms

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