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A111985 as a simple table

na(n)
01
12
2-22
3364
4-6490
5124476
6-2501116
751848984
8-1099502074
923722687340
10-518856745492
1111473878455400
12-256044198076836
135757405060992728
14-130302582530068280
152965537736183034672
16-67820940980720843322
171557676412999229945932

[1,2,-22,364,-6490,124476,-2501116,51848984,
 -1099502074,23722687340,-518856745492,
 11473878455400,-256044198076836,5757405060992728,
 -130302582530068280,2965537736183034672,
 -67820940980720843322,1557676412999229945932]