cp's OEIS Frontend

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.

A157227 Number of primitive inequivalent (up to Pi/3 rotation) non-hexagonal sublattices of hexagonal (triangular) lattice of index n.

Table of values

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

List of values

[0, 1, 1, 2, 2, 4, 2, 4, 4, 6, 4, 8, 4, 8, 8, 8, 6, 12, 6, 12, 10, 12, 8, 16, 10, 14, 12, 16, 10, 24, 10, 16, 16, 18, 16, 24, 12, 20, 18, 24, 14, 32, 14, 24, 24, 24, 16, 32, 18, 30, 24, 28, 18, 36, 24, 32, 26, 30, 20, 48, 20, 32, 32, 32, 28, 48, 22, 36, 32, 48]

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

Content is available under The OEIS End-User License Agreement.