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A002614 as a simple table

na(n)
10
2-7
3128
4-975
54608
6-16340
748384
8-124303
9281600
10-583746
111146240
12-2125108
133691008
14-6151880
1510055424
16-15914895
1724136704
18-35748899
1952583040
20-75877938
21105994240
22-145580124
23200279808
24-272040500
25359036928
26-468767690
27615599360

[0,-7,128,-975,4608,-16340,48384,-124303,281600,
 -583746,1146240,-2125108,3691008,-6151880,
 10055424,-15914895,24136704,-35748899,52583040,
 -75877938,105994240,-145580124,200279808,
 -272040500,359036928,-468767690,615599360]