# A029890 (b-file synthesized from sequence entry) 1 1 2 2 3 7 4 20 5 70 6 234 7 832 8 2956 9 10759 10 39394 11 145892 12 543564 13 2038831 14 7684116 15 29092055 16 110550260 17 421495147 18 1611662256