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A290181 as a simple table

na(n)
21
3-312
4-121680
51004000
637942020
7-801594864
86139193600
9-11831002560
10-151614128250
111346611783000
12-4592794000704
133738595861728
1415192491492360
1547281379454000
16-737660590018560
172662090686805056
18-3290770281735027
19-4884703150768920

[1,-312,-121680,1004000,37942020,-801594864,
 6139193600,-11831002560,-151614128250,
 1346611783000,-4592794000704,3738595861728,
 15192491492360,47281379454000,-737660590018560,
 2662090686805056,-3290770281735027,
 -4884703150768920]