# A019513 (b-file synthesized from sequence entry) 1 1 2 10 3 100 4 101 5 110 6 200 7 201 8 1000 9 1001 10 1010 11 1100 12 1101 13 1110 14 1200 15 10000 16 10001 17 10010 18 10100 19 10101 20 10110 21 10200 22 10201 23 11000 24 11001 25 11010 26 11100 27 11101 28 11110 29 11200 30 11201 31 12000