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A013332 as a simple table

na(n)
01
10
2-1
30
4-3
520
63
7420
8-343
98424
10-22249
11260040
12-239547
1310498748
1494138107
15-147119700
1619810696721
17-201766341168
183757708820591
19-61124264974704
20781479753273933
21-16996638107062684

[1,0,-1,0,-3,20,3,420,-343,8424,-22249,260040,
 -239547,10498748,94138107,-147119700,19810696721,
 -201766341168,3757708820591,-61124264974704,
 781479753273933,-16996638107062684]