# A129421 (b-file synthesized from sequence entry) 1 0 2 1 3 1 4 6 5 15 6 120 7 933 8 13303 9 252207 10 6450828 11 205475039 12 7936493756 13 363639228194 14 19476976825809 15 1205115679461426 16 85288127619421544 17 6845235025444882069 18 618411485467843477405 19 62471139399366989007575 20 7014991719815977343879171