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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.

A171454 G.f. satisfies: A(x) = 1 + 4*x*AGM(1, A(x)^2).

Table of values

n a(n)
0 1
1 4
2 16
3 80
4 448
5 2672
6 16640
7 106944
8 704000
9 4722608
10 32166784
11 221865280
12 1546491904
13 10876777024
14 77091573760
15 550088739584
16 3948410757120
17 28489277352112
18 206520803651712
19 1503353875355200
20 10984898330047488
21 80540719266134080
22 592362120108263424
23 4369140213882013440

List of values

[1, 4, 16, 80, 448, 2672, 16640, 106944, 704000, 4722608, 32166784, 221865280, 1546491904, 10876777024, 77091573760, 550088739584, 3948410757120, 28489277352112, 206520803651712, 1503353875355200, 10984898330047488, 80540719266134080, 592362120108263424, 4369140213882013440]

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

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