# A151520 (b-file synthesized from sequence entry) 1 1 2 4 3 6 4 21 5 47 6 134 7 323 8 876 9 2224 10 5885 11 15146 12 39574 13 102250 14 265574 15 686208 16 1775646 17 4583718 18 11835037 19 30515520 20 78652647