a(n) = 324n - 1.

Terms

a(0) =323a(1) =647a(2) =971a(3) =1295a(4) =1619a(5) =1943a(6) =2267a(7) =2591a(8) =2915a(9) =3239a(10) =3563a(11) =3887a(12) =4211a(13) =4535a(14) =4859a(15) =5183a(16) =5507a(17) =5831a(18) =6155a(19) =6479a(20) =6803a(21) =7127a(22) =7451a(23) =7775a(24) =8099a(25) =8423a(26) =8747a(27) =9071a(28) =9395a(29) =9719