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A013313 as a simple table

na(n)
11
22
3-1
4-24
5-115
6242
79179
865296
9-366535
10-14288158
11-124059241
121440362616
1357563571845
14541440703442
15-11649746422861
16-473630058916064
17-4395343414984975
18168230486159471042

[1,2,-1,-24,-115,242,9179,65296,-366535,-14288158,
 -124059241,1440362616,57563571845,541440703442,
 -11649746422861,-473630058916064,
 -4395343414984975,168230486159471042]