# A330505 (b-file synthesized from sequence entry)
1 1
2 2
3 8
4 24
5 144
6 960
7 5760
8 40320
9 524160
10 4354560
11 43545600
12 638668800
13 6706022400
14 99632332800
15 2092278988800
16 20922789888000
17 376610217984000
18 9247873130496000
19 128047474114560000
20 2919482409811968000
21 77852864261652480000