# A375810 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 30
4 192
5 1480
6 13500
7 141540
8 1676640
9 22141728
10 322388640
11 5130084960
12 88561408320
13 1648294876800
14 32898981155040
15 700940855815200
16 15877318955097600
17 380996919471168000
18 9654670629548904960
19 257627854786123261440
20 7220676423560766566400