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 | 3 |
| 2 | 491 |
| 3 | 2243 |
| 4 | 42299 |
| 5 | 274123 |
| 6 | 4310083 |
| 7 | 4310083 |
| 8 | 9065867 |
| 9 | 547580443 |
| 10 | 1885434347 |
| 11 | 8674616939 |
| 12 | 11312238283 |
| 13 | 19201563659 |
| 14 | 619849118491 |
| 15 | 4056100954547 |
| 16 | 13721202685691 |
| 17 | 119254168189363 |
| 18 | 276151474703651 |
| 19 | 2189798979924331 |
| 20 | 3153425741761723 |