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A278995 as a simple table

n a(n)
1 1
2 -2
3 -4
4 8
5 16
6 -32
7 -64
8 128
9 4864
10 -9728
11 -37888
12 223232
13 446464
14 -1482752
15 5586944
16 -11173888
17 -56557568
18 -2490368
19 -4980736
20 472383488
21 -10851713024
22 21703426048
23 90592772096
24 -263779778560
25 -10023631585280
26 -4209210589970432
27 -50541367159422976

[1,-2,-4,8,16,-32,-64,128,4864,-9728,-37888,
 223232,446464,-1482752,5586944,-11173888,
 -56557568,-2490368,-4980736,472383488,
 -10851713024,21703426048,90592772096,
 -263779778560,-10023631585280,-4209210589970432,
 -50541367159422976]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)