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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.

A352557 a(n) = number of modules with n elements over the ring of integers in the real quadratic field of discriminant 28.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 0
6 2
7 1
8 3
9 5
10 0
11 0
12 4
13 0
14 1
15 0
16 5
17 0
18 5
19 2
20 0
21 2
22 0
23 0
24 6
25 1
26 0
27 10
28 2
29 2
30 0
31 2
32 7
33 0
34 0
35 0
36 10
37 2
38 2
39 0
40 0
41 0
42 2
43 0
44 0
45 0
46 0
47 2
48 10
49 2
50 1
51 0
52 0
53 2
54 10
55 0
56 3
57 4
58 2
59 2
60 0
61 0
62 2
63 5
64 11
65 0
66 0
67 0
68 0
69 0
70 0
71 0
72 15
73 0
74 2
75 2
76 4
77 0
78 0
79 0
80 0
81 20
82 0
83 2
84 4
85 0
86 0
87 4
88 0
89 0
90 0
91 0
92 0
93 4
94 2
95 0
96 14
97 0
98 2
99 0
100 2
101 0
102 0
103 2
104 0
105 0
106 2
107 0
108 20
109 2
110 0
111 4
112 5
113 2
114 4

List of values

[1, 1, 2, 2, 0, 2, 1, 3, 5, 0, 0, 4, 0, 1, 0, 5, 0, 5, 2, 0, 2, 0, 0, 6, 1, 0, 10, 2, 2, 0, 2, 7, 0, 0, 0, 10, 2, 2, 0, 0, 0, 2, 0, 0, 0, 0, 2, 10, 2, 1, 0, 0, 2, 10, 0, 3, 4, 2, 2, 0, 0, 2, 5, 11, 0, 0, 0, 0, 0, 0, 0, 15, 0, 2, 2, 4, 0, 0, 0, 0, 20, 0, 2, 4, 0, 0, 4, 0, 0, 0, 0, 0, 4, 2, 0, 14, 0, 2, 0, 2, 0, 0, 2, 0, 0, 2, 0, 20, 2, 0, 4, 5, 2, 4]