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A085750 as a simple table

na(n)
10
2-1
34
4-12
532
6-80
7192
8-448
91024
10-2304
115120
12-11264
1324576
14-53248
15114688
16-245760
17524288
18-1114112
192359296
20-4980736
2110485760
22-22020096
2346137344
24-96468992
25201326592
26-419430400
27872415232
28-1811939328
293758096384
30-7784628224
3116106127360

[0,-1,4,-12,32,-80,192,-448,1024,-2304,5120,
 -11264,24576,-53248,114688,-245760,524288,
 -1114112,2359296,-4980736,10485760,-22020096,
 46137344,-96468992,201326592,-419430400,872415232,
 -1811939328,3758096384,-7784628224,16106127360]