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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.

A305535 Expansion of 1/(1 - x/(1 - 2*x/(1 - 2*x/(1 - 4*x/(1 - 4*x/(1 - 6*x/(1 - 6*x/(1 - ...)))))))), a continued fraction.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 75
5 557
6 5179
7 58589
8 784715
9 12154061
10 213593563
11 4195613373
12 91031201643
13 2160916171181
14 55687501548539
15 1547866851663261
16 46150908197995403
17 1469089501918434957
18 49722765216242122267
19 1782934051704982201469
20 67514992620138056010667

List of values

[1, 1, 3, 13, 75, 557, 5179, 58589, 784715, 12154061, 213593563, 4195613373, 91031201643, 2160916171181, 55687501548539, 1547866851663261, 46150908197995403, 1469089501918434957, 49722765216242122267, 1782934051704982201469, 67514992620138056010667]

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

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