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A156693 as a simple table

na(n)
01
11
21
31
4-1
52
61
7-2
8-3
96
101
11-3
12-20
1345
1424
151
16-4
17-63
181600
194725
20120
211
22-5
23-144
2414553
251408000
26-4465125
27720
281
29-6
30-275
3172576
3250426145
33-17346560000
34-46414974375
355040
361
37-7
38-468
39257125
40694987776
41-3319805256075
42-3633063526400000
436272287562165625
4440320

[1,1,1,1,-1,2,1,-2,-3,6,1,-3,-20,45,24,1,-4,-63,
 1600,4725,120,1,-5,-144,14553,1408000,-4465125,
 720,1,-6,-275,72576,50426145,-17346560000,
 -46414974375,5040,1,-7,-468,257125,694987776,
 -3319805256075,-3633063526400000,6272287562165625,
 40320]