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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.

A157231 Number of primitive inequivalent oblique sublattices of square lattice of index n (equivalence and symmetry of sublattices are determined using parent lattice symmetries).

Table of values

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

List of values

[0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 2, 4, 4, 4, 3, 7, 4, 6, 6, 7, 5, 8, 6, 8, 8, 9, 6, 14, 7, 10, 10, 11, 10, 15, 8, 13, 12, 14, 9, 20, 10, 15, 16, 16, 11, 20, 13, 20, 16, 18, 12, 25, 16, 20, 18, 20, 14, 30, 14, 22, 22, 22, 18, 32, 16, 24, 22, 32, 17, 32, 17]

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