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A013572 as a simple table

na(n)
01
11
2-1
3-3
49
525
6-145
7-539
83857
930129
10-192673
11-2816979
1217218201
13364417417
14-2297788337
15-63429766763
16417350455329
1714529736975457
18-99514205291841
19-4252720982041379
2030285000226110761

[1,1,-1,-3,9,25,-145,-539,3857,30129,-192673,
 -2816979,17218201,364417417,-2297788337,
 -63429766763,417350455329,14529736975457,
 -99514205291841,-4252720982041379,
 30285000226110761]