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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A247343 Moebius transform applied four times to sequence 1,0,0,0,....

Table of values

n a(n)
1 1
2 -4
3 -4
4 6
5 -4
6 16
7 -4
8 -4
9 6
10 16
11 -4
12 -24
13 -4
14 16
15 16
16 1
17 -4
18 -24
19 -4
20 -24
21 16
22 16
23 -4
24 16
25 6
26 16
27 -4
28 -24
29 -4
30 -64
31 -4
32 0
33 16
34 16
35 16
36 36
37 -4
38 16
39 16
40 16
41 -4
42 -64
43 -4
44 -24
45 -24
46 16
47 -4
48 -4
49 6
50 -24
51 16
52 -24
53 -4
54 16
55 16
56 16
57 16
58 16
59 -4
60 96
61 -4
62 16
63 -24
64 0
65 16
66 -64
67 -4
68 -24
69 16
70 -64

List of values

[1, -4, -4, 6, -4, 16, -4, -4, 6, 16, -4, -24, -4, 16, 16, 1, -4, -24, -4, -24, 16, 16, -4, 16, 6, 16, -4, -24, -4, -64, -4, 0, 16, 16, 16, 36, -4, 16, 16, 16, -4, -64, -4, -24, -24, 16, -4, -4, 6, -24, 16, -24, -4, 16, 16, 16, 16, 16, -4, 96, -4, 16, -24, 0, 16, -64, -4, -24, 16, -64]

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