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A084207 as a simple table

na(n)
01
11
2-2
38
4-34
5158
6-768
73858
8-19851
9104023
10-552974
112973832
12-16146688
1388376636
14-487034106
152699839758
16-15043262970
1784197804254
18-473140314356
192668221663736
20-15095165871964
2185645090974518
22-487190919969502

[1,1,-2,8,-34,158,-768,3858,-19851,104023,-552974,
 2973832,-16146688,88376636,-487034106,2699839758,
 -15043262970,84197804254,-473140314356,
 2668221663736,-15095165871964,85645090974518,
 -487190919969502]