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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.

A138805 Theta series of quadratic form x^2 + x*y + 7*y^2.

Table of values

n a(n)
0 1
1 2
2 0
3 0
4 2
5 0
6 0
7 4
8 0
9 6
10 0
11 0
12 0
13 4
14 0
15 0
16 2
17 0
18 0
19 4
20 0
21 0
22 0
23 0
24 0
25 2
26 0
27 6
28 4
29 0
30 0
31 4
32 0
33 0
34 0
35 0
36 6
37 4
38 0
39 0
40 0
41 0
42 0
43 4
44 0
45 0
46 0
47 0
48 0
49 6
50 0
51 0
52 4
53 0
54 0
55 0
56 0
57 0
58 0
59 0
60 0
61 4
62 0
63 12
64 2
65 0
66 0
67 4
68 0
69 0
70 0
71 0
72 0
73 4
74 0
75 0
76 4
77 0
78 0
79 4
80 0
81 6
82 0
83 0
84 0
85 0
86 0

List of values

[1, 2, 0, 0, 2, 0, 0, 4, 0, 6, 0, 0, 0, 4, 0, 0, 2, 0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 6, 4, 0, 0, 4, 0, 0, 0, 0, 6, 4, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 6, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 2, 0, 0, 4, 0, 0, 0, 0, 0, 4, 0, 0, 4, 0, 0, 4, 0, 6, 0, 0, 0, 0, 0]

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