# A004363 (b-file synthesized from sequence entry)
8 1
9 54
10 1770
11 45760
12 1028790
13 21111090
14 406481544
15 7471375560
16 132601016340
17 2290415157800
18 38722819230810
19 643463324051184
20 10542859559688820
21 170737530940919250
22 2738195113929528000