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A098503 as a simple table

na(n)
01
1-2
23
34
4-20
515
6-8
784
8-210
9105
1016
11-288
121512
13-2520
14945
15-32
16880
17-7920
1827720
19-34650
2010395
2164
22-2496
2334320
24-205920
25540540
26-540540
27135135
28-128
296720
30-131040
311201200
32-5405400
3311351340
34-9459450
352027025
36256
37-17408

[1,-2,3,4,-20,15,-8,84,-210,105,16,-288,1512,
 -2520,945,-32,880,-7920,27720,-34650,10395,64,
 -2496,34320,-205920,540540,-540540,135135,-128,
 6720,-131040,1201200,-5405400,11351340,-9459450,
 2027025,256,-17408]