# A352281 (b-file synthesized from sequence entry)
1 2
2 12
3 36
4 180
5 720
6 2520
7 27720
8 110880
9 720720
10 10810800
11 122522400
12 1396755360
13 6983776800
14 160626866400
15 4497552259200
16 130429015516800
17 2021649740510400
18 74801040398884800
19 3066842656354276800
20 263748468446467804800
21 18594267025475980238400