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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.

A195580 Denominators a(n) of Pythagorean approximations b(n)/a(n) to 4/5.

Table of values

n a(n)
1 4
2 600
3 2600
4 15996
5 2460800
6 10652800
7 65552004
8 10084355800
9 43655173800
10 268632095996
11 41325687609600
12 178898891577600
13 1100854263840004
14 169352657739783000
15 733127614029833000
16 4511300504584239996
17 694007150091943126400

List of values

[4, 600, 2600, 15996, 2460800, 10652800, 65552004, 10084355800, 43655173800, 268632095996, 41325687609600, 178898891577600, 1100854263840004, 169352657739783000, 733127614029833000, 4511300504584239996, 694007150091943126400]

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

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