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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.

A359807 a(1) = 0; thereafter a(n) is the largest a(i) + i which is < n among i = 1..n-1.

Table of values

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

List of values

[0, 1, 1, 3, 4, 4, 4, 7, 7, 9, 10, 11, 11, 11, 11, 15, 16, 16, 16, 19, 19, 21, 21, 23, 24, 25, 26, 26, 26, 26, 26, 31, 31, 33, 34, 35, 35, 35, 35, 39, 40, 40, 40, 43, 44, 44, 44, 47, 47, 49, 49, 51, 51, 53, 54, 55, 56, 57, 57, 57, 57, 57, 57, 63, 64, 64, 64, 67, 67, 69, 69, 71, 72, 73, 74, 74, 74, 74, 74]

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