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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.

A217771 Expansion of (phi(-x) / phi(-x^3))^2 in powers of x where phi() is a Ramanujan theta function.

Table of values

n a(n)
0 1
1 -4
2 4
3 4
4 -12
5 8
6 12
7 -32
8 20
9 28
10 -72
11 48
12 60
13 -152
14 96
15 120
16 -300
17 184
18 228
19 -560
20 344
21 416
22 -1008
23 608
24 732
25 -1756
26 1048
27 1252
28 -2976
29 1768
30 2088
31 -4928
32 2900
33 3408
34 -7992
35 4672
36 5460
37 -12728
38 7408
39 8600
40 -19944
41 11544
42 13344
43 -30800
44 17744
45 20424

List of values

[1, -4, 4, 4, -12, 8, 12, -32, 20, 28, -72, 48, 60, -152, 96, 120, -300, 184, 228, -560, 344, 416, -1008, 608, 732, -1756, 1048, 1252, -2976, 1768, 2088, -4928, 2900, 3408, -7992, 4672, 5460, -12728, 7408, 8600, -19944, 11544, 13344, -30800, 17744, 20424]

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

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