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A355768 as a simple table

na(n)
01
11
2-2
36
4-28
5260
6-3948
771120
8-1392368
929971008
10-724981920
1119800726528
12-603571233120
1320210951379840
14-734663902256256
1528785160833254400
16-1210241780559067392
1754390280325210271744
18-2602745536670709682176
19132118736078618372579328

[1,1,-2,6,-28,260,-3948,71120,-1392368,29971008,
 -724981920,19800726528,-603571233120,
 20210951379840,-734663902256256,28785160833254400,
 -1210241780559067392,54390280325210271744,
 -2602745536670709682176,132118736078618372579328]