# A171968 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 3 4 1 5 5 6 3 7 7 8 1 9 9 10 5 11 13 12 3 13 7 14 11 15 15 16 1 17 17 18 9 19 25 20 5 21 13 22 21 23 29 24 3 25 7 26 11 27 15 28 19 29 23 30 27 31 31 32 1 33 33 34 17 35 49 36 9 37 25 38 41 39 57 40 5 41 13 42 21 43 29 44 37 45 45 46 53 47 61 48 3 49 7 50 11 51 15 52 19 53 23 54 27 55 31 56 35 57 39 58 43 59 47 60 51 61 55 62 59 63 63