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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.

A338828 For any number with ternary representation (t(1), t(2), ..., t(k)), the ternary representation of a(n) is (abs(t(1)-t(k)), abs(t(2)-t(k-1)), ..., abs(t(k)-t(1))).

Table of values

n a(n)
0 0
1 0
2 0
3 4
4 0
5 4
6 8
7 4
8 0
9 10
10 0
11 10
12 10
13 0
14 10
15 10
16 0
17 10
18 20
19 10
20 0
21 20
22 10
23 0
24 20
25 10
26 0
27 28
28 0
29 28
30 40
31 12
32 40
33 52
34 24
35 52
36 40
37 12
38 40
39 28
40 0
41 28
42 40
43 12
44 40
45 52
46 24
47 52
48 40
49 12
50 40
51 28
52 0
53 28
54 56
55 28
56 0
57 68
58 40
59 12
60 80
61 52
62 24
63 68
64 40
65 12
66 56
67 28
68 0
69 68

List of values

[0, 0, 0, 4, 0, 4, 8, 4, 0, 10, 0, 10, 10, 0, 10, 10, 0, 10, 20, 10, 0, 20, 10, 0, 20, 10, 0, 28, 0, 28, 40, 12, 40, 52, 24, 52, 40, 12, 40, 28, 0, 28, 40, 12, 40, 52, 24, 52, 40, 12, 40, 28, 0, 28, 56, 28, 0, 68, 40, 12, 80, 52, 24, 68, 40, 12, 56, 28, 0, 68]

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