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A193618 as a simple table

na(n)
01
12
2-2
3-28
454
5860
6-2004
7-33720
886054
91492908
10-4019452
11-71101832
12198310460
133555617432
14-10168382696
15-184127171952
16536496907782
179788598556876
18-28937139277804
19-531135371147368
201588378827366868
2129295861148032584

[1,2,-2,-28,54,860,-2004,-33720,86054,1492908,
 -4019452,-71101832,198310460,3555617432,
 -10168382696,-184127171952,536496907782,
 9788598556876,-28937139277804,-531135371147368,
 1588378827366868,29295861148032584]