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A093615 as a simple table

na(n)
00
11
2-1
33
4-15
585
6-570
74509
8-40804
9414864
10-4686570
1158245650
12-789691134
1311598605460
14-183459343613
153109122970590
16-56203651969935
171079493501290439
18-21953265755518782
19471258656426134701
20-10648683969964745520
21252651472831081785300

[0,1,-1,3,-15,85,-570,4509,-40804,414864,-4686570,
 58245650,-789691134,11598605460,-183459343613,
 3109122970590,-56203651969935,1079493501290439,
 -21953265755518782,471258656426134701,
 -10648683969964745520,252651472831081785300]