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A012355 as a simple table

na(n)
00
10
22
3-3
416
5-50
6440
7-2856
830896
9-291528
103518848
11-41141320
12556495520
13-7659162576
14116623578864
15-1844238858840
1631500762034176
17-562615136891072
1810696734155925504
19-212805382639718016
204464074777217786112
21-97816050420003646080

[0,0,2,-3,16,-50,440,-2856,30896,-291528,3518848,
 -41141320,556495520,-7659162576,116623578864,
 -1844238858840,31500762034176,-562615136891072,
 10696734155925504,-212805382639718016,
 4464074777217786112,-97816050420003646080]