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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.

A164516 Infinite set of Petoukhov 2^n x 2^n Petoukhov matrices by antidiagonals, generated from w = (-.5 + sqrt(-3)/2).

Table of values

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

List of values

[-1, 2, 2, -1, 1, -2, -2, 4, 1, 4, -2, -2, -2, -2, 4, 1, 4, -2, -2, 1, -1, 2, 2, -4, -1, -4, 2, 2, 2, 2, -4, -4, -1, -4, -4, 8, 8, 2, 2, 8, 8, -4, -4, -4, -1, -4, -4, -4, 2, 2, 2, 2, 2, 2, 2, 2, -4, -4, -4, -1, -4, -4, -4, -4, 8, 8, 2, 2, 8, 8, -4, -4, -1, -4, -4, 2, 2, 2, 2, -4, -1, -4, 2, 2]

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