# A178957 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 6
4 12
5 60
6 180
7 1008
8 20160
9 25920
10 14175
11 6652800
12 23950080
13 141523200
14 544864320
15 100590336000
16 213497856000
17 3952082534400
18 200074178304000
19 3577797070848000
20 15595525693440000
21 51711479930880000
22 28100018194440192000
23 1846572624206069760000
24 14101100039391805440000
25 168600109166641152000000
26 2100476360034404352000000
27 6405217323775501271040000
28 418802671169936621568000000
29 2506168365572477878272000000
30 2368329105465991594967040000000