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A085750 as a simple table

n a(n)
1 0
2 -1
3 4
4 -12
5 32
6 -80
7 192
8 -448
9 1024
10 -2304
11 5120
12 -11264
13 24576
14 -53248
15 114688
16 -245760
17 524288
18 -1114112
19 2359296
20 -4980736
21 10485760
22 -22020096
23 46137344
24 -96468992
25 201326592
26 -419430400
27 872415232
28 -1811939328
29 3758096384
30 -7784628224
31 16106127360

[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]

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Last modified March 19 00:15 EDT 2019. Contains 321306 sequences. (Running on oeis4.)