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A171780 as a simple table

na(n)
11
2-1
33
4-12
555
6-273
71431
8-7837
944726
10-266381
111658300
12-10768609
1372407500
14-498510748
153477131466
16-24461950817
17174793982029
18-1294469021982
1910177610535232
20-85391010070808
21741460526149745
22-6291905077685633

[1,-1,3,-12,55,-273,1431,-7837,44726,-266381,
 1658300,-10768609,72407500,-498510748,3477131466,
 -24461950817,174793982029,-1294469021982,
 10177610535232,-85391010070808,741460526149745,
 -6291905077685633]