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A127189 as a simple table

na(n)
01
11
2-5
339
4-423
55985
6-105885
72269575
8-57475215
91684565505
10-56176247925
112101511463975
12-87163146984375
133969387329933025
14-196863216968342925
1510560219055989978375
16-609129291476291961375
1737591662102746977850625
18-2471292534125033454961125

[1,1,-5,39,-423,5985,-105885,2269575,-57475215,
 1684565505,-56176247925,2101511463975,
 -87163146984375,3969387329933025,
 -196863216968342925,10560219055989978375,
 -609129291476291961375,37591662102746977850625,
 -2471292534125033454961125]