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.

A228156 Expansion of sqrt((1+4*x)/AGM(1+4*x,1-4*x)) where AGM denotes the arithmetic-geometric mean.

Table of values

n a(n)
0 1
1 2
2 0
3 8
4 2
5 68
6 32
7 720
8 464
9 8480
10 6656
11 106368
12 95912
13 1390928
14 1392512
15 18734144
16 20371650
17 257955716
18 300101760
19 3613109008
20 4448177412
21 51302395528
22 66289160512
23 736588435360
24 992578330048
25 10674012880512
26 14924667774976
27 155890890782720
28 225244659392784
29 2291995151532576
30 3410654921389824

List of values

[1, 2, 0, 8, 2, 68, 32, 720, 464, 8480, 6656, 106368, 95912, 1390928, 1392512, 18734144, 20371650, 257955716, 300101760, 3613109008, 4448177412, 51302395528, 66289160512, 736588435360, 992578330048, 10674012880512, 14924667774976, 155890890782720, 225244659392784, 2291995151532576, 3410654921389824]