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A015172 as a simple table

na(n)
01
12
2-5
3116
42797
5480614
6-90693665
7125808208472
8190450108052689
92111092262515670858
10-25557558806111498581565
112266716939357158770139731004
12219542291935127655798395905040053

[1,2,-5,116,2797,480614,-90693665,125808208472,
 190450108052689,2111092262515670858,
 -25557558806111498581565,
 2266716939357158770139731004,
 219542291935127655798395905040053]