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 | 3 |
| 3 | 19 |
| 4 | 271 |
| 5 | 7085 |
| 6 | 251429 |
| 7 | 10997806 |
| 8 | 564316854 |
| 9 | 33175912910 |
| 10 | 2196968168590 |
| 11 | 161790768056642 |
| 12 | 13114202824936638 |
| 13 | 1160158996141467678 |
| 14 | 111226473580172327222 |
| 15 | 11486922450679555836573 |