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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.

A259581 Reciprocity array of 3; rectangular, read by antidiagonals.

Table of values

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

List of values

[3, 3, 3, 3, 3, 3, 3, 4, 4, 3, 3, 4, 6, 4, 3, 3, 5, 6, 6, 5, 3, 3, 5, 7, 6, 7, 5, 3, 3, 6, 9, 9, 9, 9, 6, 3, 3, 6, 9, 10, 10, 10, 9, 6, 3, 3, 7, 10, 12, 13, 13, 12, 10, 7, 3, 3, 7, 12, 12, 15, 15, 15, 12, 12, 7, 3, 3, 8, 12, 15, 17, 18, 18, 17, 15, 12, 8, 3]

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