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A121922 as a simple table

na(n)
0-1
11
2-3
3-1
44
5-11
61
7-5
818
9-50
10-1
116
12-27
1396
14-274
151
16-7
1738
18-168
19600
20-1764
21-1
228
23-51
24272
25-1200
264320
27-13068
281
29-9
3066
31-414
322200
33-9720
3435280
35-109584
36-1
3710
38-83
39600
40-3750
4119920
42-88200
43322560
44-1026576
451
46-11
47102
48-836
496024
50-37620
51199920
52-887040
533265920
54-10628640

[-1,1,-3,-1,4,-11,1,-5,18,-50,-1,6,-27,96,-274,1,
 -7,38,-168,600,-1764,-1,8,-51,272,-1200,4320,
 -13068,1,-9,66,-414,2200,-9720,35280,-109584,-1,
 10,-83,600,-3750,19920,-88200,322560,-1026576,1,
 -11,102,-836,6024,-37620,199920,-887040,3265920,
 -10628640]