# A184358 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 72
4 900
5 16200
6 396900
7 12700800
8 514382400
9 25719120000
10 1556006760000
11 112032486720000
12 9466745127840000
13 927741022528320000
14 104370865034436000000
15 13359470724407808000000
16 1930443519676928256000000
17 312731850187662377472000000