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A030131 as a simple table

na(n)
01
1-1
2-4
3-16
4-73
5-341
6-1659
7-8483
8-44144
9-236626
10-1282073
11-7078309
12-39389088
13-221480060
14-1259127130
15-7134579098
16-41630476786
17-232579012470
18-1437468607632
19-7355318282652
20-54666868678671

[1,-1,-4,-16,-73,-341,-1659,-8483,-44144,-236626,
 -1282073,-7078309,-39389088,-221480060,
 -1259127130,-7134579098,-41630476786,
 -232579012470,-1437468607632,-7355318282652,
 -54666868678671]