Numbers k such that 0 and 1 occur juxtaposed in the base-10 representation of k but not of k-1.

Terms

a(0) =10a(1) =100a(2) =201a(3) =210a(4) =301a(5) =310a(6) =401a(7) =410a(8) =501a(9) =510a(10) =601a(11) =610a(12) =701a(13) =710a(14) =801a(15) =810a(16) =901a(17) =910a(18) =1000a(19) =1201a(20) =1210a(21) =1301a(22) =1310a(23) =1401a(24) =1410a(25) =1501a(26) =1510a(27) =1601a(28) =1610a(29) =1701