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A290182 as a simple table

na(n)
21
3-72
4-194400
5-28866400
613994100
79650004336
8-99683138560
9-1007380800
105570606272950
11-32186306471000
12-2717893793664
13724443400725408
14-2662202398202200
15-401005712372400
1619385312101171200
1724633489938571456
18-449375771787124707

[1,-72,-194400,-28866400,13994100,9650004336,
 -99683138560,-1007380800,5570606272950,
 -32186306471000,-2717893793664,724443400725408,
 -2662202398202200,-401005712372400,
 19385312101171200,24633489938571456,
 -449375771787124707]