# A108217 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 7
4 26
5 126
6 744
7 5160
8 41040
9 367920
10 3669120
11 40279680
12 482630400
13 6266937600
14 87657292800
15 1313901388800
16 21009968179200
17 356995102464000
18 6423296495616000
19 122000787836928000
20 2439304381882368000
21 51212587272118272000
22 1126433629785784320000