# A053620 (b-file synthesized from sequence entry) 2 1 3 2 4 2 5 3 6 3 7 3 8 4 9 4 10 4 11 5 12 5 13 5 14 6 15 6 16 6 17 7 18 7 19 7 20 7 21 8 22 8 23 8 24 9 25 9 26 9 27 9 28 10 29 10 30 10 31 10 32 11 33 11 34 11 35 11 36 12 37 12 38 12 39 12 40 13 41 13 42 13 43 13 44 14 45 14 46 14 47 14 48 14 49 15 50 15 51 15 52 15 53 16 54 16 55 16 56 16 57 17 58 17 59 17 60 17 61 17 62 18 63 18 64 18 65 18 66 19 67 19 68 19 69 19 70 19 71 20 72 20