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A094384 as a simple table

n a(n)
1 1
2 -2
3 4
4 16
5 -32
6 -128
7 -512
8 4096
9 -8192
10 -32768
11 -131072
12 1048576
13 4194304
14 -33554432
15 268435456
16 4294967296
17 -8589934592
18 -34359738368
19 -137438953472
20 1099511627776
21 4398046511104
22 -35184372088832
23 281474976710656

[1,-2,4,16,-32,-128,-512,4096,-8192,-32768,
 -131072,1048576,4194304,-33554432,268435456,
 4294967296,-8589934592,-34359738368,-137438953472,
 1099511627776,4398046511104,-35184372088832,
 281474976710656]

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Last modified February 21 02:02 EST 2020. Contains 332086 sequences. (Running on oeis4.)