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A012929 as a simple table

na(n)
00
12
2-1
312
4-30
5262
6-1215
711480
8-79212
9843946
10-7748685
1193797220
12-1071775914
1314707276846
14-200262193131
153096277157360
16-48775756669080
17843212284894418
18-15047773283930841
19288546782603059900

[0,2,-1,12,-30,262,-1215,11480,-79212,843946,
 -7748685,93797220,-1071775914,14707276846,
 -200262193131,3096277157360,-48775756669080,
 843212284894418,-15047773283930841,
 288546782603059900]