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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.

A158122 G.f. A(x) satisfies: A(x)^2 = 1/AGM(1, 1 - 8*x/A(x)^2 ).

Table of values

n a(n)
0 1
1 2
2 0
3 0
4 2
5 -4
6 0
7 0
8 -16
9 40
10 0
11 0
12 200
13 -544
14 0
15 0
16 -3006
17 8540
18 0
19 0
20 49956
21 -145720
22 0
23 0
24 -884352
25 2625648
26 0
27 0
28 16349648
29 -49161024
30 0
31 0
32 -311986480
33 947069352
34 0
35 0
36 6098614912
37 -18650752400
38 0
39 0
40 -121497078016
41 373773754912
42 0
43 0

List of values

[1, 2, 0, 0, 2, -4, 0, 0, -16, 40, 0, 0, 200, -544, 0, 0, -3006, 8540, 0, 0, 49956, -145720, 0, 0, -884352, 2625648, 0, 0, 16349648, -49161024, 0, 0, -311986480, 947069352, 0, 0, 6098614912, -18650752400, 0, 0, -121497078016, 373773754912, 0, 0]

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