# A047121 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 5 4 9 5 18 6 36 7 69 8 134 9 263 10 526 11 1052 12 2085 13 4143 14 8250 15 16500 16 33000 17 65851 18 131484 19 262668 20 525336 21 1050672 22 2100045 23 4198157 24 8393603 25 16787206 26 33574412 27 67136750 28 134255332 29 268484858 30 536969716 31 1073939432 32 2147761687