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A009151 as a simple table

na(n)
01
10
21
3-3
416
5-100
6736
7-6216
859284
9-630288
107391836
11-94796020
121319653336
13-19816887168
14319274039176
15-5492805409560
16100490908021456
17-1947909828835456
1839875223857927824
19-859529863811898288

[1,0,1,-3,16,-100,736,-6216,59284,-630288,7391836,
 -94796020,1319653336,-19816887168,319274039176,
 -5492805409560,100490908021456,-1947909828835456,
 39875223857927824,-859529863811898288]