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 | 241 |
| 3 | 8681 |
| 4 | 63645 |
| 5 | 363749 |
| 6 | 1905097 |
| 7 | 9681073 |
| 8 | 48678653 |
| 9 | 243871365 |
| 10 | 1220204441 |
| 11 | 6102563585 |
| 12 | 30515709437 |
| 13 | 152584140357 |
| 14 | 762931805705 |
| 15 | 3814681507825 |
| 16 | 19073453656861 |
| 17 | 95367363682085 |
| 18 | 476837016657945 |
| 19 | 2384185496162945 |