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A012573 as a simple table

na(n)
00
10
22
3-3
44
5-20
638
7441
8-4776
934056
10-368838
115189085
12-61808100
13666424980
14-8929309170
15147346759665
16-2283822093840
1733140217608400
18-562702300383630
1911332944235915965
20-219113911766658060

[0,0,2,-3,4,-20,38,441,-4776,34056,-368838,
 5189085,-61808100,666424980,-8929309170,
 147346759665,-2283822093840,33140217608400,
 -562702300383630,11332944235915965,
 -219113911766658060]