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A012759 as a simple table

na(n)
00
11
2-1
33
40
5-57
6405
7-1827
8-4424
9223541
10-2901285
1119263167
12121524216
13-6372341445
14112206095729
15-915357416711
16-12418256340720
17674275623382473
18-14438518400518281
19129951850481453275

[0,1,-1,3,0,-57,405,-1827,-4424,223541,-2901285,
 19263167,121524216,-6372341445,112206095729,
 -915357416711,-12418256340720,674275623382473,
 -14438518400518281,129951850481453275]