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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.

A157224 Number of primitive inequivalent (up to Pi/2 rotation) nonsquare sublattices of square lattice of index n.

Table of values

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

List of values

[0, 1, 2, 3, 2, 6, 4, 6, 6, 8, 6, 12, 6, 12, 12, 12, 8, 18, 10, 18, 16, 18, 12, 24, 14, 20, 18, 24, 14, 36, 16, 24, 24, 26, 24, 36, 18, 30, 28, 36, 20, 48, 22, 36, 36, 36, 24, 48, 28, 44, 36, 42, 26, 54, 36, 48, 40, 44, 30, 72, 30, 48, 48, 48, 40, 72, 34, 54]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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