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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.

A069816 a(n) = (sum of digits of n)^2 - (sum of digits^2 of n).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 2
12 4
13 6
14 8
15 10
16 12
17 14
18 16
19 18
20 0
21 4
22 8
23 12
24 16
25 20
26 24
27 28
28 32
29 36
30 0
31 6
32 12
33 18
34 24
35 30
36 36
37 42
38 48
39 54
40 0
41 8
42 16
43 24
44 32
45 40
46 48
47 56
48 64
49 72
50 0
51 10
52 20
53 30
54 40
55 50
56 60
57 70
58 80
59 90
60 0
61 12
62 24
63 36
64 48
65 60
66 72
67 84
68 96
69 108
70 0
71 14
72 28
73 42
74 56
75 70
76 84

List of values

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 0, 14, 28, 42, 56, 70, 84]

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