# A065953 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 1
5 2
6 6
7 8
8 40
9 720
10 560
11 4480
12 362880
13 1209600
14 13305600
15 479001600
16 188697600
17 2641766400
18 1307674368000
19 774918144000
20 1197600768000
21 44771844096000
22 3119105138688000
23 73724303278080000
24 4644631106519040000
25 374666909259202560000
26 8617338912961658880000