# A307321 (b-file synthesized from sequence entry) 0 1 1 1 2 6 3 30 4 143 5 660 6 3000 7 13448 8 59696 9 262788 10 1148738 11 4989908 12 21551733 13 92596511 14 395921737 15 1685304092 16 7143861196 17 30163965903 18 126895681419 19 531986033218 20 2222961809367 21 9260148591001 22 38461580964389 23 159302487751844 24 658054630483936 25 2711429650817356