# A196687 (b-file synthesized from sequence entry)
1 1
2 4
3 24
4 336
5 5520
6 203040
7 7025760
8 510370560
9 30163311360
10 3577017024000
11 319851801561600
12 55850407258060800
13 7021439018770176000
14 1692163531361176473600
15 284409062346887622144000
16 90395009213694143422464000
17 19571060809440210728706048000
18 7929132907666579072319471616000