# A321974 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 54
4 404
5 3598
6 37003
7 430300
8 5571147
9 79358032
10 1231990840
11 20684884234
12 373208232229
13 7197079035318
14 147658793214733
15 3210107125516682
16 73690798853163884
17 1780718798351625094
18 45171972342078432287
19 1199948465249850848608
20 33305064129201851432591
21 963911863209583899492324