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A009199 as a simple table

na(n)
01
10
22
3-6
434
5-220
61688
7-14868
8147684
9-1631376
1019821912
11-262573080
123764276712
13-58044604176
14957653604672
15-16828739439120
16313742795670288
17-6183918938706048
18128463999017594016
19-2804979941504113248

[1,0,2,-6,34,-220,1688,-14868,147684,-1631376,
 19821912,-262573080,3764276712,-58044604176,
 957653604672,-16828739439120,313742795670288,
 -6183918938706048,128463999017594016,
 -2804979941504113248]