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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.

A131301 Regular triangle read by rows: T(n,k) = 3*binomial(floor((n+k)/2),k)-2.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 1
7 4
8 1
9 1
10 1
11 4
12 7
13 1
14 1
15 1
16 7
17 7
18 10
19 1
20 1
21 1
22 7
23 16
24 10
25 13
26 1
27 1
28 1
29 10
30 16
31 28
32 13
33 16
34 1
35 1
36 1
37 10
38 28
39 28
40 43
41 16
42 19
43 1
44 1
45 1
46 13
47 28
48 58
49 43
50 61
51 19
52 22
53 1
54 1
55 1
56 13
57 43
58 58
59 103
60 61
61 82
62 22
63 25
64 1
65 1
66 1
67 16
68 43
69 103
70 103
71 166
72 82

List of values

[1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 4, 7, 1, 1, 1, 7, 7, 10, 1, 1, 1, 7, 16, 10, 13, 1, 1, 1, 10, 16, 28, 13, 16, 1, 1, 1, 10, 28, 28, 43, 16, 19, 1, 1, 1, 13, 28, 58, 43, 61, 19, 22, 1, 1, 1, 13, 43, 58, 103, 61, 82, 22, 25, 1, 1, 1, 16, 43, 103, 103, 166, 82]

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