a(n) = floor(54/n).

Terms

a(0) =54a(1) =27a(2) =18a(3) =13a(4) =10a(5) =9a(6) =7a(7) =6a(8) =6a(9) =5a(10) =4a(11) =4a(12) =4a(13) =3a(14) =3a(15) =3a(16) =3a(17) =3a(18) =2a(19) =2a(20) =2a(21) =2a(22) =2a(23) =2a(24) =2a(25) =2a(26) =2a(27) =1a(28) =1a(29) =1