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A137370 as a simple table

na(n)
11
20
31
41
5-2
61
7-8
812
9-6
101
1181
12-108
1354
14-12
151
16-1024
171280
18-640
19160
20-20
211
2215625
23-18750
249375
25-2500
26375
27-30
281
29-279936
30326592
31-163296
3245360
33-7560
34756
35-42
361
375764801
38-6588344
393294172
40-941192
41168070
42-19208
431372
44-56
451
46-134217728
47150994944
48-75497472
4922020096
50-4128768

[1,0,1,1,-2,1,-8,12,-6,1,81,-108,54,-12,1,-1024,
 1280,-640,160,-20,1,15625,-18750,9375,-2500,375,
 -30,1,-279936,326592,-163296,45360,-7560,756,-42,
 1,5764801,-6588344,3294172,-941192,168070,-19208,
 1372,-56,1,-134217728,150994944,-75497472,
 22020096,-4128768]