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 | 23 |
| 2 | 2191 |
| 3 | 178511 |
| 4 | 4208989 |
| 5 | 48989231 |
| 6 | 364568683 |
| 7 | 1996813991 |
| 8 | 8804293561 |
| 9 | 33739007399 |
| 10 | 125937424711 |
| 11 | 570623341343 |
| 12 | 3881436747541 |
| 13 | 36314872538111 |
| 14 | 383799398753059 |
| 15 | 4185897925275191 |
| 16 | 45967322049616753 |
| 17 | 505481300395601591 |
| 18 | 5559981581902310911 |
| 19 | 61159206938673444719 |