Sort then Add, a(1) =9.

Terms

a(0) =9a(1) =18a(2) =36a(3) =72a(4) =99a(5) =198a(6) =387a(7) =765a(8) =1332a(9) =2565a(10) =5121a(11) =6246a(12) =8712a(13) =9990a(14) =10989a(15) =12888a(16) =25776a(17) =51453a(18) =64908a(19) =69597a(20) =126396a(21) =250065a(22) =252621a(23) =374877a(24) =722655a(25) =948222a(26) =1170711a(27) =1281888a(28) =2410776a(29) =2535453