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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.

A087401 Triangle of n*r-binomial(r+1,2).

Table of values

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

List of values

[0, 0, 0, 0, 1, 1, 0, 2, 3, 3, 0, 3, 5, 6, 6, 0, 4, 7, 9, 10, 10, 0, 5, 9, 12, 14, 15, 15, 0, 6, 11, 15, 18, 20, 21, 21, 0, 7, 13, 18, 22, 25, 27, 28, 28, 0, 8, 15, 21, 26, 30, 33, 35, 36, 36, 0, 9, 17, 24, 30, 35, 39, 42, 44, 45, 45, 0, 10, 19, 27, 34, 40, 45, 49, 52, 54, 55, 55, 0, 11]

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