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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.

A331143 Number of coincidence site modules of icosian ring of index n.

Table of values

n a(n)
1 1
2 0
3 0
4 25
5 36
6 0
7 0
8 0
9 100
10 0
11 288
12 0
13 0
14 0
15 0
16 410
17 0
18 0
19 800
20 900
21 0
22 0
23 0
24 0
25 912
26 0
27 0
28 0
29 1800
30 0
31 2048
32 0
33 0
34 0
35 0
36 2500
37 0
38 0
39 0
40 0
41 3528
42 0
43 0
44 7200
45 3600
46 0
47 0
48 0
49 2500
50 0
51 0
52 0
53 0
54 0
55 10368
56 0
57 0
58 0
59 7200
60 0
61 7688
62 0
63 0
64 6600
65 0
66 0
67 0
68 0
69 0
70 0

List of values

[1, 0, 0, 25, 36, 0, 0, 0, 100, 0, 288, 0, 0, 0, 0, 410, 0, 0, 800, 900, 0, 0, 0, 0, 912, 0, 0, 0, 1800, 0, 2048, 0, 0, 0, 0, 2500, 0, 0, 0, 0, 3528, 0, 0, 7200, 3600, 0, 0, 0, 2500, 0, 0, 0, 0, 0, 10368, 0, 0, 0, 7200, 0, 7688, 0, 0, 6600, 0, 0, 0, 0, 0, 0]