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 | 5 |
| 3 | 45 |
| 4 | 441 |
| 5 | 4361 |
| 6 | 43165 |
| 7 | 427285 |
| 8 | 4229681 |
| 9 | 41869521 |
| 10 | 414465525 |
| 11 | 4102785725 |
| 12 | 40613391721 |
| 13 | 402031131481 |
| 14 | 3979697923085 |
| 15 | 39394948099365 |
| 16 | 389969783070561 |
| 17 | 3860302882606241 |
| 18 | 38213059042991845 |
| 19 | 378270287547312205 |