a(0)=1; a(n) = sum of all previous terms, eliminating repeated digits (starting from the left).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =32a(7) =64a(8) =128a(9) =256a(10) =512a(11) =1024a(12) =2048a(13) =4096a(14) =8192a(15) =16384a(16) =32768a(17) =653a(18) =6189a(19) =7238a(20) =7961a(21) =875a(22) =8452a(23) =9604a(24) =10658a(25) =176a(26) =17342a(27) =13468a(28) =14852a(29) =16304