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A171680 as a simple table

na(n)
11
2-1
316
4353
56535
6117764
72114521
837946999
9680940352
1012219002585
11219261167071
123934482164084
1370601418203761
141266891046596143
1522733437423387120
16407934982581860369
177320096249069704311
18131353797500724143204
192357048258764099246537

[1,-1,16,353,6535,117764,2114521,37946999,
 680940352,12219002585,219261167071,3934482164084,
 70601418203761,1266891046596143,22733437423387120,
 407934982581860369,7320096249069704311,
 131353797500724143204,2357048258764099246537]