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A012051 as a simple table

na(n)
01
11
21
32
45
516
661
7216
8937
9-1280
10-34919
11-1141504
12-13257619
13-263392128
14-3269873515
15-64804059904
16-890367567919
17-18858549039104
18-286428853272143
19-6592583427379200
20-109915623105978539

[1,1,1,2,5,16,61,216,937,-1280,-34919,-1141504,
 -13257619,-263392128,-3269873515,-64804059904,
 -890367567919,-18858549039104,-286428853272143,
 -6592583427379200,-109915623105978539]