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) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 99 |
| 3 | 1233 |
| 4 | 16929 |
| 5 | 251829 |
| 6 | 4012011 |
| 7 | 67876461 |
| 8 | 1211592897 |
| 9 | 22700600001 |
| 10 | 444567396051 |
| 11 | 9068604811209 |
| 12 | 192115381719969 |
| 13 | 4216003141209453 |
| 14 | 95631348748295259 |
| 15 | 2237799925576748709 |
| 16 | 53928909429116324481 |
| 17 | 1336410276724468307961 |