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A301271 as a simple table

na(n)
01
1-2
2-14
3-140
4-1610
5-19964
6-259532
7-3485144
8-47920730
9-670890220
10-9526641124
11-136837208872
12-1984139528644
13-28998962341720
14-426699017313880
15-6315145456245424
16-93937788661650682
17-1403541077650545484
18-21053116164758182260
19-316904801216886322440

[1,-2,-14,-140,-1610,-19964,-259532,-3485144,
 -47920730,-670890220,-9526641124,-136837208872,
 -1984139528644,-28998962341720,-426699017313880,
 -6315145456245424,-93937788661650682,
 -1403541077650545484,-21053116164758182260,
 -316904801216886322440]