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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.

A045867 Theta series of quadratic form with Gram matrix [ 4, 1, 2, 1; 1, 4, 1, 0; 2, 1, 6, -2; 1, 0, -2, 20 ].

Table of values

n a(n)
0 1
1 0
2 4
3 6
4 2
5 6
6 2
7 6
8 10
9 2
10 8
11 14
12 24
13 10
14 14
15 10
16 26
17 14
18 38
19 14
20 32
21 18
22 14
23 16
24 40
25 20
26 24
27 34
28 40
29 12
30 60
31 24
32 34
33 18
34 36
35 30
36 50
37 2
38 40
39 30
40 60
41 34
42 70
43 30
44 64
45 64
46 52
47 42
48 72
49 42
50 60
51 50
52 72
53 34
54 62
55 38
56 80
57 54
58 72
59 36
60 100
61 52
62 56
63 76
64 90
65 52
66 126
67 36
68 80
69 72
70 100

List of values

[1, 0, 4, 6, 2, 6, 2, 6, 10, 2, 8, 14, 24, 10, 14, 10, 26, 14, 38, 14, 32, 18, 14, 16, 40, 20, 24, 34, 40, 12, 60, 24, 34, 18, 36, 30, 50, 2, 40, 30, 60, 34, 70, 30, 64, 64, 52, 42, 72, 42, 60, 50, 72, 34, 62, 38, 80, 54, 72, 36, 100, 52, 56, 76, 90, 52, 126, 36, 80, 72, 100]

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