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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.

A143068 Expansion of phi(q) / phi(-q^6) in powers of q where phi() is a Ramanujan theta function.

Table of values

n a(n)
0 1
1 2
2 0
3 0
4 2
5 0
6 2
7 4
8 0
9 2
10 4
11 0
12 4
13 8
14 0
15 4
16 10
17 0
18 8
19 16
20 0
21 8
22 20
23 0
24 14
25 30
26 0
27 16
28 36
29 0
30 24
31 52
32 0
33 28
34 64
35 0
36 42
37 88
38 0
39 48
40 108
41 0
42 68
43 144
44 0
45 80
46 176
47 0
48 108
49 230
50 0
51 128
52 280
53 0
54 170
55 360
56 0
57 200
58 436
59 0
60 260
61 552
62 0
63 308
64 666
65 0
66 392
67 832
68 0

List of values

[1, 2, 0, 0, 2, 0, 2, 4, 0, 2, 4, 0, 4, 8, 0, 4, 10, 0, 8, 16, 0, 8, 20, 0, 14, 30, 0, 16, 36, 0, 24, 52, 0, 28, 64, 0, 42, 88, 0, 48, 108, 0, 68, 144, 0, 80, 176, 0, 108, 230, 0, 128, 280, 0, 170, 360, 0, 200, 436, 0, 260, 552, 0, 308, 666, 0, 392, 832, 0]

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

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