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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.

A165795 Array A(n, k) = numerator of 1/n^2 - 1/k^2 with A(0,k) = 1 and A(n,0) = -1, read by antidiagonals.

Table of values

n a(n)
0 1
1 -1
2 1
3 -1
4 0
5 1
6 -1
7 -3
8 3
9 1
10 -1
11 -8
12 0
13 8
14 1
15 -1
16 -15
17 -5
18 5
19 15
20 1
21 -1
22 -24
23 -3
24 0
25 3
26 24
27 1
28 -1
29 -35
30 -21
31 -7
32 7
33 21
34 35
35 1
36 -1
37 -48
38 -2
39 -16
40 0
41 16
42 2
43 48
44 1
45 -1
46 -63
47 -45
48 -1
49 -9
50 9
51 1
52 45
53 63
54 1
55 -1
56 -80
57 -15
58 -40
59 -5
60 0
61 5
62 40
63 15
64 80
65 1
66 -1
67 -99
68 -77
69 -55
70 -33
71 -11
72 11
73 33
74 55
75 77
76 99
77 1

List of values

[1, -1, 1, -1, 0, 1, -1, -3, 3, 1, -1, -8, 0, 8, 1, -1, -15, -5, 5, 15, 1, -1, -24, -3, 0, 3, 24, 1, -1, -35, -21, -7, 7, 21, 35, 1, -1, -48, -2, -16, 0, 16, 2, 48, 1, -1, -63, -45, -1, -9, 9, 1, 45, 63, 1, -1, -80, -15, -40, -5, 0, 5, 40, 15, 80, 1, -1, -99, -77, -55, -33, -11, 11, 33, 55, 77, 99, 1]