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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.

A332190 a(n) = 10^(2n+1) - 1 - 9*10^n.

Table of values

n a(n)
0 0
1 909
2 99099
3 9990999
4 999909999
5 99999099999
6 9999990999999
7 999999909999999
8 99999999099999999
9 9999999990999999999
10 999999999909999999999
11 99999999999099999999999
12 9999999999990999999999999
13 999999999999909999999999999
14 99999999999999099999999999999
15 9999999999999990999999999999999

List of values

[0, 909, 99099, 9990999, 999909999, 99999099999, 9999990999999, 999999909999999, 99999999099999999, 9999999990999999999, 999999999909999999999, 99999999999099999999999, 9999999999990999999999999, 999999999999909999999999999, 99999999999999099999999999999, 9999999999999990999999999999999]

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

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