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.
n | a(n) |
---|---|
1 | 990100 |
2 | 999900010000 |
3 | 999999000001000000 |
4 | 999999990000000100000000 |
5 | 999999999900000000010000000000 |
6 | 999999999999000000000001000000000000 |
7 | 999999999999990000000000000100000000000000 |