# A375799 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 36
5 240
6 1800
7 16800
8 178080
9 2086560
10 27518400
11 399168000
12 6286896000
13 107623676160
14 1984274772480
15 39143052748800
16 824445099878400
17 18450791322163200
18 437015358530150400
19 10929450232744243200
20 287728555881102336000
21 7952251084537503744000