# A181858 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 1
5 4
6 4
7 36
8 18
9 64
10 576
11 14400
12 43200
13 518400
14 518400
15 5080320
16 12700800
17 1625702400
18 1625702400
19 131681894400
20 131681894400
21 627056640000
22 13168189440000
23 1593350922240000