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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.

A207260 Triangle read by rows: T(n,k) = k^2 + (1-(-1)^(n-k))/2.

Table of values

n a(n)
0 0
1 1
2 1
3 0
4 2
5 4
6 1
7 1
8 5
9 9
10 0
11 2
12 4
13 10
14 16
15 1
16 1
17 5
18 9
19 17
20 25
21 0
22 2
23 4
24 10
25 16
26 26
27 36
28 1
29 1
30 5
31 9
32 17
33 25
34 37
35 49
36 0
37 2
38 4
39 10
40 16
41 26
42 36
43 50
44 64
45 1
46 1
47 5
48 9
49 17
50 25
51 37
52 49
53 65
54 81
55 0
56 2
57 4
58 10
59 16
60 26
61 36
62 50
63 64
64 82
65 100
66 1
67 1
68 5
69 9
70 17
71 25
72 37
73 49
74 65
75 81
76 101
77 121

List of values

[0, 1, 1, 0, 2, 4, 1, 1, 5, 9, 0, 2, 4, 10, 16, 1, 1, 5, 9, 17, 25, 0, 2, 4, 10, 16, 26, 36, 1, 1, 5, 9, 17, 25, 37, 49, 0, 2, 4, 10, 16, 26, 36, 50, 64, 1, 1, 5, 9, 17, 25, 37, 49, 65, 81, 0, 2, 4, 10, 16, 26, 36, 50, 64, 82, 100, 1, 1, 5, 9, 17, 25, 37, 49, 65, 81, 101, 121]

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