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A081046 as a simple table

na(n)
01
1-2
25
3-17
474
5-394
62484
7-18108
8149904
9-1389456
1014257440
11-160460640
121965444480
13-26029779840
14370643938560
15-5646837369600
1691657072281600
17-1579093018675200
1828779361764249600
19-553210247226470400

[1,-2,5,-17,74,-394,2484,-18108,149904,-1389456,
 14257440,-160460640,1965444480,-26029779840,
 370643938560,-5646837369600,91657072281600,
 -1579093018675200,28779361764249600,
 -553210247226470400]