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) |
|---|---|
| 2 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 47 |
| 6 | 105 |
| 7 | 536 |
| 8 | 1341 |
| 9 | 9231 |
| 10 | 24697 |
| 11 | 212594 |
| 12 | 592269 |
| 13 | 6100559 |
| 14 | 17464969 |
| 15 | 209215572 |
| 16 | 610839805 |
| 17 | 8338210079 |
| 18 | 24709115769 |
| 19 | 378460880126 |