# A293193 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 33
4 384
5 5745
6 105120
7 2273985
8 56770560
9 1606455585
10 50810457600
11 1776342038625
12 68018227200000
13 2831056111508625
14 127263741276672000
15 6144722994699914625
16 317153340121153536000
17 17425813179911850338625
18 1015487574490836615168000
19 62559446107077837491198625