Sort then Add, a(1)=27.

Terms

a(0) =27a(1) =54a(2) =99a(3) =198a(4) =387a(5) =765a(6) =1332a(7) =2565a(8) =5121a(9) =6246a(10) =8712a(11) =9990a(12) =10989a(13) =12888a(14) =25776a(15) =51453a(16) =64908a(17) =69597a(18) =126396a(19) =250065a(20) =252621a(21) =374877a(22) =722655a(23) =948222a(24) =1170711a(25) =1281888a(26) =2410776a(27) =2535453a(28) =4870008a(29) =4874796