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A012574 as a simple table

na(n)
00
10
22
3-3
44
5-20
6278
7-2079
812024
9-102024
101526202
11-21144915
12254194620
13-3422013660
1460148579710
15-1146224919735
1621194144971440
17-407432463085200
188837992445168370
19-209438776595814435
205103026808528257460
21-128021892811081933860

[0,0,2,-3,4,-20,278,-2079,12024,-102024,1526202,
 -21144915,254194620,-3422013660,60148579710,
 -1146224919735,21194144971440,-407432463085200,
 8837992445168370,-209438776595814435,
 5103026808528257460,-128021892811081933860]