# A073880 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 5 5 11 6 22 7 33 8 44 9 101 10 111 11 121 12 131 13 202 14 212 15 222 16 1001 17 1111 18 1221 19 1331 20 2002 21 2112 22 2222 23 10001 24 10101 25 10201 26 10301 27 11011 28 11111 29 12021 30 13031 31 22222 32 100001 33 101101 34 102201 35 103301 36 110011 37 111111 38 120021 39 130031 40 20202 41 1000001 42 1001001 43 1002001 44 1003001 45 1010101 46 1011101 47 1012101 48 1020201 49 2042402 50 10000001 51 10011001 52 10022001 53 10033001 54 10100101 55 10111101 56 10200201 57 10300301