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A118687 as a simple table

na(n)
01
11
2-1
31
4-2
51
61
7-3
83
9-1
101
11-4
126
13-4
141
151
16-8
1722
18-28
1917
20-4
211
22-12
2354
24-116
25129
26-72
2716
281
29-36
30342
31-1412
322913
33-3168
341744
35-384
361
37-60
381206
39-9620
4036801
41-73080
4277776
43-42240
449216
451
46-252
4712726
48-241172
491883841
50-7138872
5114109136
52-14975232
538119296
54-1769472

[1,1,-1,1,-2,1,1,-3,3,-1,1,-4,6,-4,1,1,-8,22,-28,
 17,-4,1,-12,54,-116,129,-72,16,1,-36,342,-1412,
 2913,-3168,1744,-384,1,-60,1206,-9620,36801,
 -73080,77776,-42240,9216,1,-252,12726,-241172,
 1883841,-7138872,14109136,-14975232,8119296,
 -1769472]