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A015305 as a simple table

na(n)
51
6-21
7903
8-25585
9875007
10-27125217
11882215391
12-28005209505
13899790907743
14-28735427761313
15920460637644639
16-29439916001972385
17942314556807454559
18-30150270336284213409
19964869381941043396447
20-30874848551033891160225

[1,-21,903,-25585,875007,-27125217,882215391,
 -28005209505,899790907743,-28735427761313,
 920460637644639,-29439916001972385,
 942314556807454559,-30150270336284213409,
 964869381941043396447,-30874848551033891160225]