# A096632 (b-file synthesized from sequence entry)
2 1
3 2
4 3
5 12
6 20
7 180
8 1260
9 1120
10 9072
11 90720
12 184800
13 29937600
14 389188800
15 13453440
16 8172964800
17 130767436800
18 15247232000
19 100037089152000
20 380140938777600
21 10429106688000
22 1451447220787200
23 159659194286592000