Numbers written in base of triangular numbers.

Terms

a(0) =1a(1) =2a(2) =10a(3) =11a(4) =12a(5) =100a(6) =101a(7) =102a(8) =110a(9) =1000a(10) =1001a(11) =1002a(12) =1010a(13) =1011a(14) =10000a(15) =10001a(16) =10002a(17) =10010a(18) =10011a(19) =10012a(20) =100000a(21) =100001a(22) =100002a(23) =100010a(24) =100011a(25) =100012a(26) =100100a(27) =1000000a(28) =1000001a(29) =1000002