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A077607 as a simple table

na(n)
11
2-2
3-2
4-8
5-44
6-296
7-2312
8-20384
9-199376
10-2138336
11-24936416
12-314142848
13-4252773824
14-61594847360
15-950757812864
16-15586971531776
17-270569513970944
18-4959071121374720
19-95721139472072192
20-1941212789888952320
21-41271304403571227648

[1,-2,-2,-8,-44,-296,-2312,-20384,-199376,
 -2138336,-24936416,-314142848,-4252773824,
 -61594847360,-950757812864,-15586971531776,
 -270569513970944,-4959071121374720,
 -95721139472072192,-1941212789888952320,
 -41271304403571227648]