# A000348 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 4 5 12 6 9 7 72 8 160 9 428 10 2434 11 3011 12 10337 13 126962 14 264182 15 783550 16 5004266 17 34340141 18 176302123 19 1188146567 20 4457147441 21 7845512385 22 132253267889 23 1004345333251 24 3865703506342 25 40719018858150 26 213982561376958 27 1266218151414286 28 10976172953868304 29 59767467676582641 30 512279001476451101 31 6189067229056357433