# A122596 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 18
4 85
5 492
6 3360
7 26400
8 234356
9 2318280
10 25278120
11 301143360
12 3891041400
13 54191780160
14 809233528320
15 12897125337600
16 218497018912704
17 3920950622655360
18 74295176671900800
19 1482268147441804800