a(n) = floor(80/n).

Terms

a(0) =80a(1) =40a(2) =26a(3) =20a(4) =16a(5) =13a(6) =11a(7) =10a(8) =8a(9) =8a(10) =7a(11) =6a(12) =6a(13) =5a(14) =5a(15) =5a(16) =4a(17) =4a(18) =4a(19) =4a(20) =3a(21) =3a(22) =3a(23) =3a(24) =3a(25) =3a(26) =2a(27) =2a(28) =2a(29) =2