[(1-e^n)/(1-e*n)], where [ ]=floor.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =11a(5) =26a(6) =60a(7) =143a(8) =345a(9) =841a(10) =2071a(11) =5147a(12) =12884a(13) =32453a(14) =82189a(15) =209121a(16) =534274a(17) =1369940a(18) =3524020a(19) =9091340a(20) =23515042a(21) =60965624a(22) =158399334a(23) =412354169a(24) =1075389431a(25) =2809166692a(26) =7349381323a(27) =19254701768a(28) =50511699310a(29) =132671378996