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A012783 as a simple table

na(n)
01
13
25
3-889
4-82167
5-7869301
6-906141171
7-128450716913
8-22562588189167
9-4955964959446253
10-1381444138161821675
11-495014642393801914473
12-227710892670360844819175
13-131704509800404485504904293

[1,3,5,-889,-82167,-7869301,-906141171,
 -128450716913,-22562588189167,-4955964959446253,
 -1381444138161821675,-495014642393801914473,
 -227710892670360844819175,
 -131704509800404485504904293]