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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.

A109439 Triangle read by rows, in which row n gives coefficients in expansion of ((1 - x^n)/(1 - x))^3.

Table of values

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

List of values

[1, 1, 3, 3, 1, 1, 3, 6, 7, 6, 3, 1, 1, 3, 6, 10, 12, 12, 10, 6, 3, 1, 1, 3, 6, 10, 15, 18, 19, 18, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 25, 27, 27, 25, 21, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 28, 33, 36, 37, 36, 33, 28, 21, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 28, 36, 42, 46, 48, 48]

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