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A012911 as a simple table

na(n)
00
12
2-3
312
4-66
5488
6-4464
749112
8-628624
99201728
10-151417984
112768998144
12-55689376768
131221892625536
14-29042327308032
15743397015460096
16-20387623448193024
17596407256671842304
18-18537290145521811456

[0,2,-3,12,-66,488,-4464,49112,-628624,9201728,
 -151417984,2768998144,-55689376768,1221892625536,
 -29042327308032,743397015460096,
 -20387623448193024,596407256671842304,
 -18537290145521811456]