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 | 15 |
| 2 | 145 |
| 3 | 1455 |
| 4 | 15265 |
| 5 | 164175 |
| 6 | 1787185 |
| 7 | 19565295 |
| 8 | 214749505 |
| 9 | 2359900815 |
| 10 | 25947190225 |
| 11 | 285360498735 |
| 12 | 3138672517345 |
| 13 | 34523932847055 |
| 14 | 379755937098865 |
| 15 | 4177278686993775 |
| 16 | 45949882451462785 |
| 17 | 505447791438746895 |