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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.

A272822 G.f. satisfies: A(x) = 1 + 2*x*AGM(A(x)^2, A(-x)^2).

Table of values

n a(n)
0 1
1 2
2 0
3 0
4 0
5 -8
6 0
7 0
8 0
9 88
10 0
11 0
12 0
13 -1248
14 0
15 0
16 0
17 20056
18 0
19 0
20 0
21 -347360
22 0
23 0
24 0
25 6323744
26 0
27 0
28 0
29 -119299200
30 0
31 0
32 0
33 2311546200
34 0
35 0
36 0
37 -45729024480
38 0
39 0
40 0
41 919817083680
42 0
43 0
44 0
45 -18755086062720
46 0
47 0
48 0
49 386776930629408
50 0
51 0
52 0
53 -8053207409464448
54 0
55 0
56 0
57 169063213304845696
58 0
59 0
60 0
61 -3574582279957007872
62 0
63 0
64 0
65 76052003974889011032
66 0
67 0
68 0
69 -1626996714019973193696
70 0
71 0
72 0
73 34977427889190951942176
74 0
75 0
76 0
77 -755249894672423411380352
78 0
79 0
80 0

List of values

[1, 2, 0, 0, 0, -8, 0, 0, 0, 88, 0, 0, 0, -1248, 0, 0, 0, 20056, 0, 0, 0, -347360, 0, 0, 0, 6323744, 0, 0, 0, -119299200, 0, 0, 0, 2311546200, 0, 0, 0, -45729024480, 0, 0, 0, 919817083680, 0, 0, 0, -18755086062720, 0, 0, 0, 386776930629408, 0, 0, 0, -8053207409464448, 0, 0, 0, 169063213304845696, 0, 0, 0, -3574582279957007872, 0, 0, 0, 76052003974889011032, 0, 0, 0, -1626996714019973193696, 0, 0, 0, 34977427889190951942176, 0, 0, 0, -755249894672423411380352, 0, 0, 0]

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