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A308538 as a simple table

na(n)
01
1-1
23
3-11
4-47
52111
6-18589
7-671803
824578625
9328227551
10-44122149981
11-17436709707
12129678315723089
13-1671362093527073
14-621466693739336509
1516245508786340273349
164705502566521408713473
17-172007688705762528111809
18-54084940569279187064459581

[1,-1,3,-11,-47,2111,-18589,-671803,24578625,
 328227551,-44122149981,-17436709707,
 129678315723089,-1671362093527073,
 -621466693739336509,16245508786340273349,
 4705502566521408713473,-172007688705762528111809,
 -54084940569279187064459581]