10 times A007623.

Terms

a(0) =0a(1) =10a(2) =100a(3) =110a(4) =200a(5) =210a(6) =1000a(7) =1010a(8) =1100a(9) =1110a(10) =1200a(11) =1210a(12) =2000a(13) =2010a(14) =2100a(15) =2110a(16) =2200a(17) =2210a(18) =3000a(19) =3010a(20) =3100a(21) =3110a(22) =3200a(23) =3210a(24) =10000a(25) =10010a(26) =10100a(27) =10110a(28) =10200a(29) =10210