# A330506 (b-file synthesized from sequence entry)
1 1
2 2
3 7
4 24
5 129
6 840
7 5265
8 40320
9 434385
10 3900960
11 40809825
12 558835200
13 6335076825
14 91070179200
15 1641957141825
16 20922789888000
17 359796258446625
18 7663952552256000
19 122832552380162625
20 2615369658789888000
21 62315614994643635625