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 | 3 |
| 2 | 15 |
| 3 | 101 |
| 4 | 841 |
| 5 | 8283 |
| 6 | 93815 |
| 7 | 1198029 |
| 8 | 16997041 |
| 9 | 264864419 |
| 10 | 4492081151 |
| 11 | 82299283669 |
| 12 | 1618674299769 |
| 13 | 33997164987019 |
| 14 | 759059595497511 |
| 15 | 17945237236457533 |
| 16 | 447676430154815137 |
| 17 | 11748882878147100691 |
| 18 | 323494584038834863087 |
| 19 | 9322205037165367256837 |