# A173211 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 84
4 4584
5 469440
6 76982940
7 18391183020
8 6011375932800
9 2570927357779200
10 1391371186976089200
11 928454707768609098000
12 748225283395263813216000
13 715960677236011729384262400