# A138017 (b-file synthesized from sequence entry) 1 1 2 3 3 5 4 15 5 37 6 111 7 317 8 951 9 2821 10 8463 11 25325 12 75975 13 227797 14 683391 15 2049917 16 6149751 17 18448741 18 55346223