# A076289 (b-file synthesized from sequence entry) 1 1 2 11 3 101 4 111 5 1001 6 1111 7 10001 8 10101 9 11111 10 100001 11 111111 12 1000001 13 1001001 14 1010101 15 1111111 16 10000001 17 11111111 18 100000001 19 100010001 20 101010101 21 111111111 22 1000000001 23 1001001001 24 1111111111 25 10000000001 26 10000100001 27 10101010101 28 11111111111