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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.

A243204 Expansion of 2*x/((1-sqrt(1-2*(1-sqrt(1-4*x))))*sqrt(1-2*(1-sqrt(1-4*x))) * sqrt(1-4*x)).

Table of values

n a(n)
0 1
1 2
2 8
3 35
4 160
5 752
6 3605
7 17544
8 86400
9 429605
10 2153008
11 10860720
12 55086421
13 280692440
14 1435868960
15 7369703660
16 37934443008
17 195748568256
18 1012292239955
19 5244933087000
20 27220980100160
21 141486701601630
22 736387364237280
23 3837221866576800
24 20016901815607125

List of values

[1, 2, 8, 35, 160, 752, 3605, 17544, 86400, 429605, 2153008, 10860720, 55086421, 280692440, 1435868960, 7369703660, 37934443008, 195748568256, 1012292239955, 5244933087000, 27220980100160, 141486701601630, 736387364237280, 3837221866576800, 20016901815607125]

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

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