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A129273 as a simple table

na(n)
01
1-1
22
3-7
426
5-95
6344
7-1256
84654
9-17470
1066234
11-253192
12974992
13-3778966
1414729200
15-57683066
16226806148
17-894791874
183540105138
19-14039128725
2055786507642
21-222047783006
22885073034920
23-3532110787193
2414110281656038

[1,-1,2,-7,26,-95,344,-1256,4654,-17470,66234,
 -253192,974992,-3778966,14729200,-57683066,
 226806148,-894791874,3540105138,-14039128725,
 55786507642,-222047783006,885073034920,
 -3532110787193,14110281656038]