# A020957 (b-file synthesized from sequence entry) 1 3 2 6 3 11 4 19 5 32 6 54 7 89 8 147 9 240 10 392 11 637 12 1035 13 1678 14 2720 15 4405 16 7133 17 11546 18 18688 19 30243 20 48941 21 79194 22 128146 23 207351 24 335509 25 542872 26 878394 27 1421279 28 2299687 29 3720980 30 6020682 31 9741677 32 15762375 33 25504068 34 41266460 35 66770545