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A274075 as a simple table

na(n)
03
1-1
219
3-25
4195
5-401
62131
7-5545
824323
9-72097
10285459
11-910009
123407043
13-11311665
1441065043
15-139462985
16497736707
17-1711838529
186052005907
19-20960815961
2073717030595
21-256312368337
22898804827731
23-3131899112169
2410964830193411
25-38253117375201

[3,-1,19,-25,195,-401,2131,-5545,24323,-72097,
 285459,-910009,3407043,-11311665,41065043,
 -139462985,497736707,-1711838529,6052005907,
 -20960815961,73717030595,-256312368337,
 898804827731,-3131899112169,10964830193411,
 -38253117375201]