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A127190 as a simple table

na(n)
01
1-1
27
3-75
41089
5-20025
6446535
7-11715795
8353743425
9-12084751665
10460905128775
11-19414191656475
12895154327661825
13-44844879530075625
142425592881954016775
15-140881250370301315875
168745197742014671562625
17-577792180264444615094625
1840483044280613870034474375

[1,-1,7,-75,1089,-20025,446535,-11715795,
 353743425,-12084751665,460905128775,
 -19414191656475,895154327661825,
 -44844879530075625,2425592881954016775,
 -140881250370301315875,8745197742014671562625,
 -577792180264444615094625,
 40483044280613870034474375]