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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.

A296180 Triangle read by rows: T(n, k) = 3*(n - k)*k + 1, n >= 0, 0 <= k <= n.

Table of values

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

List of values

[1, 1, 1, 1, 4, 1, 1, 7, 7, 1, 1, 10, 13, 10, 1, 1, 13, 19, 19, 13, 1, 1, 16, 25, 28, 25, 16, 1, 1, 19, 31, 37, 37, 31, 19, 1, 1, 22, 37, 46, 49, 46, 37, 22, 1, 1, 25, 43, 55, 61, 61, 55, 43, 25, 1, 1, 28, 49, 64, 73, 76, 73, 64, 49, 28, 1]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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