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A208605 as a simple table

na(n)
11
2-2
34
4-8
514
6-24
740
8-64
9101
10-156
11236
12-352
13518
14-752
151080
16-1536
172162
18-3018
194180
20-5744
217840
22-10632
2314328
24-19200
2525591
26-33932
2744776
28-58816
2976918
30-100176
31129952
32-167936
33216240
34-277476
35354864
36-452392
37574958
38-728568
39920600

[1,-2,4,-8,14,-24,40,-64,101,-156,236,-352,518,
 -752,1080,-1536,2162,-3018,4180,-5744,7840,-10632,
 14328,-19200,25591,-33932,44776,-58816,76918,
 -100176,129952,-167936,216240,-277476,354864,
 -452392,574958,-728568,920600]