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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.

A052146 a(n) = floor((sqrt(1+8*n)-3)/2).

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 1
6 2
7 2
8 2
9 2
10 3
11 3
12 3
13 3
14 3
15 4
16 4
17 4
18 4
19 4
20 4
21 5
22 5
23 5
24 5
25 5
26 5
27 5
28 6
29 6
30 6
31 6
32 6
33 6
34 6
35 6
36 7
37 7
38 7
39 7
40 7
41 7
42 7
43 7
44 7
45 8
46 8
47 8
48 8
49 8
50 8
51 8
52 8
53 8
54 8
55 9
56 9
57 9
58 9
59 9
60 9
61 9
62 9
63 9
64 9
65 9
66 10
67 10
68 10
69 10
70 10
71 10
72 10
73 10
74 10
75 10
76 10
77 10
78 11
79 11
80 11
81 11
82 11
83 11
84 11

List of values

[0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11]

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