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A156285 as a simple table

na(n)
01
1-1
2-21
371
42541
5-14641
6-771561
76242711
8437721081
9-4555133281
10-399147115101
115076970085351
12533834157267621
13-8024733763147921
14-984414289344742641
1517074591123571719991
162393808447230495554161
17-47056485265721520250561

[1,-1,-21,71,2541,-14641,-771561,6242711,
 437721081,-4555133281,-399147115101,5076970085351,
 533834157267621,-8024733763147921,
 -984414289344742641,17074591123571719991,
 2393808447230495554161,-47056485265721520250561]