# A003980 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 2 5 4 6 2 7 7 8 4 9 6 10 4 11 12 12 4 13 20 14 7 15 8 16 8 17 33 18 6 19 54 20 8 21 14 22 12 23 88 24 8 25 20 26 20 27 18 28 14 29 143 30 8 31 232 32 16 33 24 34 33 35 28 36 12 37 376 38 54 39 40 40 16 41 609 42 14 43 986 44 24 45 24 46 88 47 1596 48 16 49 56 50 20 51 66 52 40 53 2583 54 18 55 48 56 28 57 108 58 143 59 4180 60 16 61 6764 62 232 63 42 64 32 65 80 66 24 67 10945 68 66