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A012021 as a simple table

n a(n)
0 1
1 -1
2 1
3 167
4 -14303
5 1383887
6 -170123615
7 26560717367
8 -5162935778879
9 1219537456849055
10 -340794504958201919
11 109077799391707298759
12 -38112045733323708444959
13 13139859774638771226676847

[1,-1,1,167,-14303,1383887,-170123615,26560717367,
 -5162935778879,1219537456849055,
 -340794504958201919,109077799391707298759,
 -38112045733323708444959,
 13139859774638771226676847]

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Last modified May 10 05:10 EDT 2021. Contains 343748 sequences. (Running on oeis4.)