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A204115 as a simple table

na(n)
11
2-1
32
4-4
51
66
7-16
88
9-1
1036
11-108
1269
13-15
141
15360
16-1152
17834
18-230
1926
20-1
215280
22-17696
2314368
24-4668
25682
26-44
271
28147840
29-506048
30426568
31-147856
3224262
33-1952
3473
35-1
366800640
37-23573888
3820317360

[1,-1,2,-4,1,6,-16,8,-1,36,-108,69,-15,1,360,
 -1152,834,-230,26,-1,5280,-17696,14368,-4668,682,
 -44,1,147840,-506048,426568,-147856,24262,-1952,
 73,-1,6800640,-23573888,20317360]