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A066668 as a simple table

na(n)
01
11
21
3-1
4-19
5-151
6-1091
7-7841
8-56519
9-396271
10-2442439
11-7701409
12145269541
134833158329
14104056218421
152002667085119
1637109187217649
17679877731030049
1812440309297451121
19227773259993414719
204155839606711748061
2174724654677947488521
221293162252850914402221

[1,1,1,-1,-19,-151,-1091,-7841,-56519,-396271,
 -2442439,-7701409,145269541,4833158329,
 104056218421,2002667085119,37109187217649,
 679877731030049,12440309297451121,
 227773259993414719,4155839606711748061,
 74724654677947488521,1293162252850914402221]