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A064326 as a simple table

na(n)
01
11
2-3
325
4-251
52817
6-33843
7425769
8-5537835
973865617
10-1004862179
1113888533561
12-194475377243
132752994728225
14-39333541106835
15566464908534345
16-8214515461250955
17119845125957958065
18-1757855400878129475
1925906894146115000665
20-383443906519878272955

[1,1,-3,25,-251,2817,-33843,425769,-5537835,
 73865617,-1004862179,13888533561,-194475377243,
 2752994728225,-39333541106835,566464908534345,
 -8214515461250955,119845125957958065,
 -1757855400878129475,25906894146115000665,
 -383443906519878272955]