# A232231 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 13 4 45 5 153 6 517 7 1737 8 5829 9 19561 10 65637 11 220233 12 738949 13 2479401 14 8319141 15 27913225 16 93657285 17 314248425 18 1054398181 19 3537823689 20 11870464773 21 39828987049 22 133638255909 23 448396626825 24 1504505828677 25 5048070509673 26 16937798036325 27 56831417423689 28 190686534309765 29 639810795074601