# A173094 (b-file synthesized from sequence entry)
1 2
2 3
3 3
4 6
5 12
6 60
7 660
8 38940
9 25661460
10 999231590940
11 25641740502411581460
12 25622037156669717708454796390940
13 656993627914472375437286314449293585586011019581460