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A012704 as a simple table

na(n)
00
10
22
3-3
416
5-50
6248
7-504
8-1584
994536
10-1222848
1116675560
12-150260640
131047505680
1412037737840
15-574519410360
1616243532175360
17-341049918471360
186341386354483200
19-86729688288097920
20452837960565661440
2131661940854577882240
22-1682428415293547953920

[0,0,2,-3,16,-50,248,-504,-1584,94536,-1222848,
 16675560,-150260640,1047505680,12037737840,
 -574519410360,16243532175360,-341049918471360,
 6341386354483200,-86729688288097920,
 452837960565661440,31661940854577882240,
 -1682428415293547953920]