# A171450 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 15 5 54 6 231 7 1133 8 6082 9 34397 10 200063 11 1180798 12 7023103 13 41946973 14 251144922 15 1505966757 16 9040214223 17 54314351878 18 326565963479 19 1964805696525 20 11828911080050 21 71258494789421 22 429525155047263 23 2590571415647886