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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.

A055263 a(n) = Sum of digits of (n + a(n-1)).

Table of values

n a(n)
0 0
1 1
2 3
3 6
4 1
5 6
6 3
7 1
8 9
9 9
10 10
11 3
12 6
13 10
14 6
15 3
16 10
17 9
18 9
19 10
20 3
21 6
22 10
23 6
24 3
25 10
26 9
27 9
28 10
29 12
30 6
31 10
32 6
33 12
34 10
35 9
36 9
37 10
38 12
39 6
40 10
41 6
42 12
43 10
44 9
45 9
46 10
47 12
48 6
49 10
50 6
51 12
52 10
53 9
54 9
55 10
56 12
57 15
58 10
59 15
60 12
61 10
62 9
63 9
64 10
65 12
66 15
67 10
68 15
69 12
70 10
71 9
72 9
73 10
74 12
75 15
76 10
77 15
78 12
79 10
80 9
81 9
82 10

List of values

[0, 1, 3, 6, 1, 6, 3, 1, 9, 9, 10, 3, 6, 10, 6, 3, 10, 9, 9, 10, 3, 6, 10, 6, 3, 10, 9, 9, 10, 12, 6, 10, 6, 12, 10, 9, 9, 10, 12, 6, 10, 6, 12, 10, 9, 9, 10, 12, 6, 10, 6, 12, 10, 9, 9, 10, 12, 15, 10, 15, 12, 10, 9, 9, 10, 12, 15, 10, 15, 12, 10, 9, 9, 10, 12, 15, 10, 15, 12, 10, 9, 9, 10]

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