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A012354 as a simple table

na(n)
00
10
22
3-3
416
5-50
6560
7-4116
849376
9-495648
106643648
11-86408080
121355660480
13-21635261856
14389870008320
15-7287717739680
16148738206314496
17-3175392718618112
1872630134425104384
19-1740244201350372864
2044148745987324567552
21-1171621057231560284160

[0,0,2,-3,16,-50,560,-4116,49376,-495648,6643648,
 -86408080,1355660480,-21635261856,389870008320,
 -7287717739680,148738206314496,-3175392718618112,
 72630134425104384,-1740244201350372864,
 44148745987324567552,-1171621057231560284160]