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A154232 as a simple table

na(n)
00
11
2-1
3-1
40
5-1
65
7-5
816
9-55
1035
11-1045
1264
13-30305
14105
15-1242505
16160
17-68337775
18231
19-4851982025
20320
21-431826400225
22429
23-47069077624525
24560
25-6166049168812775
26715
27-955737621165980125
28896
29-172988509431042402625

[0,1,-1,-1,0,-1,5,-5,16,-55,35,-1045,64,-30305,
 105,-1242505,160,-68337775,231,-4851982025,320,
 -431826400225,429,-47069077624525,560,
 -6166049168812775,715,-955737621165980125,896,
 -172988509431042402625]