# A225621 (b-file synthesized from sequence entry)
1 1
2 4
3 20
4 108
5 632
6 4060
7 28968
8 231000
9 2058096
10 20375964
11 222393800
12 2653879624
13 34365597840
14 479776469848
15 7181892528272
16 114731622081840
17 1948073992109280
18 35031456100431900
19 665075537735997960
20 13292908401187179240
21 279000321119414475600