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A173895 as a simple table

na(n)
01
11
2-1
30
49
5-48
615
72448
8-24927
923424
103091311
11-47659200
1288056969
1310702667520
14-225139993377
15679791291648
1678646340795265
17-2128005345251328
189456106738649631
191053535684549174272

[1,1,-1,0,9,-48,15,2448,-24927,23424,3091311,
 -47659200,88056969,10702667520,-225139993377,
 679791291648,78646340795265,-2128005345251328,
 9456106738649631,1053535684549174272]