# A128021 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 3 5 5 6 8 7 14 8 25 9 44 10 79 11 144 12 264 13 487 14 905 15 1689 16 3167 17 5962 18 11261 19 21337 20 40540 21 77219 22 147418 23 282017 24 540533 25 1037823 26 1995814 27 3843790 28 7413023 29 14314803 30 27675286 31 53565070 32 103782323 33 201274808 34 390709922 35 759093562