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 | 1 |
| 2 | 11 |
| 3 | 102 |
| 4 | 1003 |
| 5 | 10004 |
| 6 | 100005 |
| 7 | 1000006 |
| 8 | 10000007 |
| 9 | 100000008 |
| 10 | 1000000009 |
| 11 | 10000000019 |
| 12 | 100000000029 |
| 13 | 1000000000039 |
| 14 | 10000000000049 |
| 15 | 100000000000059 |
| 16 | 1000000000000069 |
| 17 | 10000000000000079 |
| 18 | 100000000000000089 |
| 19 | 1000000000000000099 |
| 20 | 10000000000000000199 |