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) |
|---|---|
| 3 | 149 |
| 4 | 1009 |
| 5 | 10009 |
| 6 | 100049 |
| 7 | 1000849 |
| 8 | 10000169 |
| 9 | 100000891 |
| 10 | 1000000009 |
| 11 | 10000001041 |
| 12 | 100000000669 |
| 13 | 1000000000091 |
| 14 | 10000000001011 |
| 15 | 100000000000469 |
| 16 | 1000000000004449 |
| 17 | 10000000000001101 |
| 18 | 100000000000000049 |