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A012005 as a simple table

na(n)
0-1
1-2
214
3568
49704
5-229712
6-35581456
7-1790014592
872312646784
928603722780928
103039116082823424
11-154149928667313152
12-135793191600734657536
13-25782484156469234296832

[-1,-2,14,568,9704,-229712,-35581456,-1790014592,
 72312646784,28603722780928,3039116082823424,
 -154149928667313152,-135793191600734657536,
 -25782484156469234296832]