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A354065 as a simple table

na(n)
11
2-2
32
4-8
556
6-496
73184
8-22784
9273920
10-4539136
1148104704
12-506000384
1310591523840
14-204528633856
152888557717504
16-53417657237504
171249919350046720
18-28453501844586496
19624022403933077504
20-13729309300086800384
21372737701735949926400
22-11010228423219933085696

[1,-2,2,-8,56,-496,3184,-22784,273920,-4539136,
 48104704,-506000384,10591523840,-204528633856,
 2888557717504,-53417657237504,1249919350046720,
 -28453501844586496,624022403933077504,
 -13729309300086800384,372737701735949926400,
 -11010228423219933085696]