# A250128 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 9 4 30 5 96 6 309 7 996 8 3207 9 10329 10 33267 11 107142 12 345072 13 1111371 14 3579384 15 11528097 16 37128459 17 119579361 18 385128390 19 1240380240 20 3994883733