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A104064 as a simple table

na(n)
15
2-2
325
4-20
52
6125
7-150
845
9-2
10625
11-1000
12500
13-80
142
153125
16-6250
174375
18-1250
19125
20-2
2115625
22-37500
2333750
24-14000
252625
26-180
272
2878125
29-218750
30240625
31-131250
3236750
33-4900
34245
35-2
36390625
37-1250000
381625000
39-1100000
40412500
41-84000
428400
43-320
442

[5,-2,25,-20,2,125,-150,45,-2,625,-1000,500,-80,2,
 3125,-6250,4375,-1250,125,-2,15625,-37500,33750,
 -14000,2625,-180,2,78125,-218750,240625,-131250,
 36750,-4900,245,-2,390625,-1250000,1625000,
 -1100000,412500,-84000,8400,-320,2]