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A009439 as a simple table

na(n)
00
11
2-3
38
4-16
529
6-191
71980
8-14456
985713
10-657171
117877880
12-97759608
131100545341
14-13021637695
15185198054748
16-2933940050000
1746990261427073
18-774002505048195
1913811029423532424
20-266175983849182016

[0,1,-3,8,-16,29,-191,1980,-14456,85713,-657171,
 7877880,-97759608,1100545341,-13021637695,
 185198054748,-2933940050000,46990261427073,
 -774002505048195,13811029423532424,
 -266175983849182016]