a(n) = floor(72/n).

Terms

a(0) =72a(1) =36a(2) =24a(3) =18a(4) =14a(5) =12a(6) =10a(7) =9a(8) =8a(9) =7a(10) =6a(11) =6a(12) =5a(13) =5a(14) =4a(15) =4a(16) =4a(17) =4a(18) =3a(19) =3a(20) =3a(21) =3a(22) =3a(23) =3a(24) =2a(25) =2a(26) =2a(27) =2a(28) =2a(29) =2