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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.

A332150 a(n) = 5*(10^(2n+1)-1)/9 - 5*10^n.

Table of values

n a(n)
0 0
1 505
2 55055
3 5550555
4 555505555
5 55555055555
6 5555550555555
7 555555505555555
8 55555555055555555
9 5555555550555555555
10 555555555505555555555
11 55555555555055555555555
12 5555555555550555555555555
13 555555555555505555555555555
14 55555555555555055555555555555
15 5555555555555550555555555555555

List of values

[0, 505, 55055, 5550555, 555505555, 55555055555, 5555550555555, 555555505555555, 55555555055555555, 5555555550555555555, 555555555505555555555, 55555555555055555555555, 5555555555550555555555555, 555555555555505555555555555, 55555555555555055555555555555, 5555555555555550555555555555555]

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

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