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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.

A221645 Square array read by antidiagonals: T(n,k^2) = A040000(n) (= 1,2,2,2,...) if n=0 (mod k), T(n,k) = 0 else, n>=0, k>=1.

Table of values

n a(n)
1 1
2 2
3 0
4 2
5 0
6 0
7 2
8 0
9 0
10 1
11 2
12 0
13 0
14 0
15 0
16 2
17 0
18 0
19 2
20 0
21 0
22 2
23 0
24 0
25 0
26 0
27 0
28 0
29 2
30 0
31 0
32 2
33 0
34 0
35 0
36 0
37 2
38 0
39 0
40 0
41 0
42 0
43 0
44 0
45 1
46 2
47 0
48 0
49 2
50 0
51 0
52 0
53 0
54 0
55 0
56 2
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 0
66 0
67 2
68 0
69 0
70 2
71 0
72 0
73 0
74 0
75 2
76 0
77 0
78 0
79 2
80 0
81 0
82 0
83 0
84 0
85 0
86 0
87 0
88 0
89 0
90 0
91 0

List of values

[1, 2, 0, 2, 0, 0, 2, 0, 0, 1, 2, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

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