cp's OEIS Frontend

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.

A208850 Expansion of phi(q^2) / phi(-q) in powers of q where phi() is a Ramanujan theta function.

Table of values

n a(n)
0 1
1 2
2 6
3 12
4 22
5 40
6 68
7 112
8 182
9 286
10 440
11 668
12 996
13 1464
14 2128
15 3056
16 4342
17 6116
18 8538
19 11820
20 16248
21 22176
22 30068
23 40528
24 54308
25 72378
26 95976
27 126648
28 166352
29 217560
30 283344
31 367552
32 474998
33 611624
34 784812
35 1003712
36 1279562
37 1626216
38 2060708
39 2603856

List of values

[1, 2, 6, 12, 22, 40, 68, 112, 182, 286, 440, 668, 996, 1464, 2128, 3056, 4342, 6116, 8538, 11820, 16248, 22176, 30068, 40528, 54308, 72378, 95976, 126648, 166352, 217560, 283344, 367552, 474998, 611624, 784812, 1003712, 1279562, 1626216, 2060708, 2603856]

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

Content is available under The OEIS End-User License Agreement.