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A009428 as a simple table

na(n)
00
11
2-1
35
4-12
529
6-165
7993
8-7056
962649
10-540225
115044445
12-56372844
13685980437
14-8868937077
15124034330553
16-1855540686720
1729570974192753
18-502444027531233
199041323571823925
20-171561171727515820
213427632445624110605

[0,1,-1,5,-12,29,-165,993,-7056,62649,-540225,
 5044445,-56372844,685980437,-8868937077,
 124034330553,-1855540686720,29570974192753,
 -502444027531233,9041323571823925,
 -171561171727515820,3427632445624110605]