The Hwang-Deutsch function f_3(n).

Terms

a(0) =3a(1) =4a(2) =5a(3) =7a(4) =9a(5) =12a(6) =16a(7) =20a(8) =26a(9) =34a(10) =43a(11) =55a(12) =71a(13) =88a(14) =112a(15) =144a(16) =178a(17) =227a(18) =291a(19) =358a(20) =455a(21) =583a(22) =717a(23) =912a(24) =1168a(25) =1436a(26) =1826a(27) =2338a(28) =2875a(29) =3655