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A300457 as a simple table

na(n)
01
1-1
2-3
3-1
425
5624
69871
7170470
83027249
955077245
10979330606
1115079702923
1294670678245
13-7958168036625
14-626145997536240
15-34564907982551791
16-1733699815491494303
17-84294315853736719077
18-4067859614343931897505
19-196552300464314521511610
20-9519733465269825759734169

[1,-1,-3,-1,25,624,9871,170470,3027249,55077245,
 979330606,15079702923,94670678245,-7958168036625,
 -626145997536240,-34564907982551791,
 -1733699815491494303,-84294315853736719077,
 -4067859614343931897505,-196552300464314521511610,
 -9519733465269825759734169]