# A053572 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 16
5 75
6 384
7 1805
8 8640
9 42336
10 207368
11 995808
12 5184000
13 24192672
14 121730700
15 594350400
16 2921811200