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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.

A169890 Carryless sum 1+2+3+...+n.

Table of values

n a(n)
0 0
1 1
2 3
3 6
4 0
5 5
6 1
7 8
8 6
9 5
10 15
11 26
12 38
13 41
14 55
15 60
16 76
17 83
18 91
19 0
20 20
21 41
22 63
23 86
24 0
25 25
26 41
27 68
28 86
29 5
30 35
31 66
32 98
33 21
34 55
35 80
36 16
37 43
38 71
39 0
40 40
41 81
42 23
43 66
44 0
45 45
46 81
47 28
48 66
49 5
50 55
51 6
52 58
53 1
54 55
55 0
56 56
57 3
58 51
59 0
60 60
61 21
62 83
63 46
64 0
65 65
66 21
67 88
68 46
69 5
70 75
71 46
72 18
73 81
74 55
75 20
76 96
77 63
78 31

List of values

[0, 1, 3, 6, 0, 5, 1, 8, 6, 5, 15, 26, 38, 41, 55, 60, 76, 83, 91, 0, 20, 41, 63, 86, 0, 25, 41, 68, 86, 5, 35, 66, 98, 21, 55, 80, 16, 43, 71, 0, 40, 81, 23, 66, 0, 45, 81, 28, 66, 5, 55, 6, 58, 1, 55, 0, 56, 3, 51, 0, 60, 21, 83, 46, 0, 65, 21, 88, 46, 5, 75, 46, 18, 81, 55, 20, 96, 63, 31]

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