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A152571 as a simple table

n a(n)
0 -1
1 1
2 -1
3 4
4 -1
5 -1
6 16
7 -4
8 -1
9 -1
10 64
11 -16
12 -4
13 -1
14 -1
15 256
16 -64
17 -16
18 -4
19 -1
20 -1
21 1024
22 -256
23 -64
24 -16
25 -4
26 -1
27 -1
28 4096
29 -1024
30 -256
31 -64
32 -16
33 -4
34 -1
35 -1
36 16384
37 -4096
38 -1024
39 -256
40 -64
41 -16
42 -4
43 -1
44 -1
45 65536
46 -16384
47 -4096
48 -1024
49 -256
50 -64
51 -16
52 -4
53 -1
54 -1

[-1,1,-1,4,-1,-1,16,-4,-1,-1,64,-16,-4,-1,-1,256,
 -64,-16,-4,-1,-1,1024,-256,-64,-16,-4,-1,-1,4096,
 -1024,-256,-64,-16,-4,-1,-1,16384,-4096,-1024,
 -256,-64,-16,-4,-1,-1,65536,-16384,-4096,-1024,
 -256,-64,-16,-4,-1,-1]

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Last modified May 25 11:07 EDT 2020. Contains 334592 sequences. (Running on oeis4.)