Triangle, read by rows, in which the n-th row contains n smallest n-digit numbers.

Terms

a(0) =1a(1) =10a(2) =11a(3) =100a(4) =101a(5) =102a(6) =1000a(7) =1001a(8) =1002a(9) =1003a(10) =10000a(11) =10001a(12) =10002a(13) =10003a(14) =10004a(15) =100000a(16) =100001a(17) =100002a(18) =100003a(19) =100004a(20) =100005a(21) =1000000a(22) =1000001a(23) =1000002a(24) =1000003a(25) =1000004a(26) =1000005a(27) =1000006a(28) =10000000a(29) =10000001