# A256031 (b-file synthesized from sequence entry)
1 2
2 3
3 12
4 30
5 240
6 840
7 10080
8 45360
9 725760
10 3991680
11 79833600
12 518918400
13 12454041600
14 93405312000
15 2615348736000
16 22230464256000
17 711374856192000
18 6758061133824000
19 243290200817664000
20 2554547108585472000
21 102181884343418880000
22 1175091669949317120000