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A183895 as a simple table

n a(n)
0 1
1 -1
2 -2
3 8
4 32
5 -128
6 -1024
7 16384
8 262144
9 -4194304
10 -134217728
11 8589934592
12 549755813888
13 -35184372088832
14 -4503599627370496
15 1152921504606846976
16 295147905179352825856
17 -75557863725914323419136
18 -38685626227668133590597632
19 39614081257132168796771975168
20 40564819207303340847894502572032
21 -41538374868278621028243970633760768
22 -85070591730234615865843651857942052864
23 348449143727040986586495598010130648530944

[1,-1,-2,8,32,-128,-1024,16384,262144,-4194304,
 -134217728,8589934592,549755813888,
 -35184372088832,-4503599627370496,
 1152921504606846976,295147905179352825856,
 -75557863725914323419136,
 -38685626227668133590597632,
 39614081257132168796771975168,
 40564819207303340847894502572032,
 -41538374868278621028243970633760768,
 -85070591730234615865843651857942052864,
 348449143727040986586495598010130648530944]

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Last modified November 29 08:19 EST 2020. Contains 338761 sequences. (Running on oeis4.)