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A203995 as a simple table

na(n)
11
2-1
31
4-2
51
60
7-2
83
9-1
10-4
118
120
13-4
141
15-16
1656
17-56
1810
195
20-1
21-48
22224
23-360
24224
25-35
26-6
271
28-128
29736
30-1584
311560
32-672
3384
347
35-1
36-320
372176
38-5824
397744
40-5280
411680
42-168
43-8
441
45-768
466016
47-19200
4832032
49-29744

[1,-1,1,-2,1,0,-2,3,-1,-4,8,0,-4,1,-16,56,-56,10,
 5,-1,-48,224,-360,224,-35,-6,1,-128,736,-1584,
 1560,-672,84,7,-1,-320,2176,-5824,7744,-5280,1680,
 -168,-8,1,-768,6016,-19200,32032,-29744]